Radio Link Monitoring in New Radio

ABSTRACT

A wireless device receives one or more messages comprising one or more configuration parameters. The one or more configuration parameters indicate: a plurality of control resource sets (coresets); a first group of search space sets for monitoring the plurality of coresets in a first mode; and a second group of search space sets for monitoring the plurality of coresets in a second mode. Reference signals for radio link monitoring are selected based on the first group of search space sets. The reference signals for the radio link monitoring are measured for both in the first mode and the second mode.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/842,501, filed May 2, 2019, which is hereby incorporated by referencein its entirety.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Examples of several of the various embodiments of the present disclosureare described herein with reference to the drawings.

FIG. 1 is a diagram of an example RAN architecture as per an aspect ofan embodiment of the present disclosure.

FIG. 2A is a diagram of an example user plane protocol stack as per anaspect of an embodiment of the present disclosure.

FIG. 2B is a diagram of an example control plane protocol stack as peran aspect of an embodiment of the present disclosure.

FIG. 3 is a diagram of an example wireless device and two base stationsas per an aspect of an embodiment of the present disclosure.

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplinkand downlink signal transmission as per an aspect of an embodiment ofthe present disclosure.

FIG. 5A is a diagram of an example uplink channel mapping and exampleuplink physical signals as per an aspect of an embodiment of the presentdisclosure.

FIG. 5B is a diagram of an example downlink channel mapping and exampledownlink physical signals as per an aspect of an embodiment of thepresent disclosure.

FIG. 6 is a diagram depicting an example transmission time or receptiontime for a carrier as per an aspect of an embodiment of the presentdisclosure.

FIG. 7A and FIG. 7B are diagrams depicting example sets of OFDMsubcarriers as per an aspect of an embodiment of the present disclosure.

FIG. 8 is a diagram depicting example OFDM radio resources as per anaspect of an embodiment of the present disclosure.

FIG. 9A is a diagram depicting an example CSI-RS and/or SS blocktransmission in a multi-beam system.

FIG. 9B is a diagram depicting an example downlink beam managementprocedure as per an aspect of an embodiment of the present disclosure.

FIG. 10 is an example diagram of configured BWPs as per an aspect of anembodiment of the present disclosure.

FIG. 11A, and FIG. 11B are diagrams of an example multi connectivity asper an aspect of an embodiment of the present disclosure.

FIG. 12 is a diagram of an example random access procedure as per anaspect of an embodiment of the present disclosure.

FIG. 13 is a structure of example MAC entities as per an aspect of anembodiment of the present disclosure.

FIG. 14 is a diagram of an example RAN architecture as per an aspect ofan embodiment of the present disclosure.

FIG. 15 is a diagram of example RRC states as per an aspect of anembodiment of the present disclosure.

FIG. 16A and FIG. 16B are examples of power saving mode as per an aspectof an embodiment of the present disclosure.

FIG. 17 is an example of monitoring downlink control channel as per anaspect of an embodiment of the present disclosure.

FIG. 18 is an example of monitoring downlink control channel as per anaspect of an embodiment of the present disclosure.

FIG. 19 is an example of a configuration of a downlink control channelas per an aspect of an embodiment of the present disclosure.

FIG. 20 is an example of a configuration of a downlink control channelas per an aspect of an embodiment of the present disclosure.

FIG. 21 is an example of monitoring downlink control channel as per anaspect of an embodiment of the present disclosure.

FIG. 22 is an example of a configuration of a downlink control channelas per an aspect of an embodiment of the present disclosure.

FIG. 23 is an example of monitoring downlink control channel as per anaspect of an embodiment of the present disclosure.

FIG. 24 is an example of monitoring downlink control channel as per anaspect of an embodiment of the present disclosure.

FIG. 25 is a flow diagram of an aspect of an example embodiment of thepresent disclosure.

FIG. 26 is a flow diagram of an aspect of an example embodiment of thepresent disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Example embodiments of the present disclosure enable operation of radiolink monitoring. Embodiments of the technology disclosed herein may beemployed in the technical field of multicarrier communication systems.More particularly, the embodiments of the technology disclosed hereinmay relate to radio link monitoring in a multicarrier communicationsystem.

The following Acronyms are used throughout the present disclosure:

3GPP 3rd Generation Partnership Project

5GC 5G Core Network

ACK Acknowledgement

AMF Access and Mobility Management Function

ARQ Automatic Repeat Request

AS Access Stratum

ASIC Application-Specific Integrated Circuit

BA Bandwidth Adaptation

BCCH Broadcast Control Channel

BCH Broadcast Channel

BPSK Binary Phase Shift Keying

BWP Bandwidth Part

CA Carrier Aggregation

CC Component Carrier

CCCH Common Control CHannel

CDMA Code Division Multiple Access

CN Core Network

CP Cyclic Prefix

CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplex

C-RNTI Cell-Radio Network Temporary Identifier

CS Configured Scheduling

CSI Channel State Information

CSI-RS Channel State Information-Reference Signal

CQI Channel Quality Indicator

CSS Common Search Space

CU Central Unit

DC Dual Connectivity

DCCH Dedicated Control Channel

DCI Downlink Control Information

DL Downlink

DL-SCH Downlink Shared CHannel

DM-RS DeModulation Reference Signal

DRB Data Radio Bearer

DRX Discontinuous Reception

DTCH Dedicated Traffic Channel

DU Distributed Unit

EPC Evolved Packet Core

E-UTRA Evolved UMTS Terrestrial Radio Access

E-UTRAN Evolved-Universal Terrestrial Radio Access Network

FDD Frequency Division Duplex

FPGA Field Programmable Gate Arrays

F1-C F1-Control plane

F1-U F1-User plane

gNB next generation Node B

HARQ Hybrid Automatic Repeat reQuest

HDL Hardware Description Languages

IE Information Element

IP Internet Protocol

LCID Logical Channel Identifier

LTE Long Term Evolution

MAC Media Access Control

MCG Master Cell Group

MCS Modulation and Coding Scheme

MeNB Master evolved Node B

MIB Master Information Block

MME Mobility Management Entity

MN Master Node

NACK Negative Acknowledgement

NAS Non-Access Stratum

NG CP Next Generation Control Plane

NGC Next Generation Core

NG-C NG-Control plane

ng-eNB next generation evolved Node B

NG-U NG-User plane

NR New Radio

NR MAC New Radio MAC

NR PDCP New Radio PDCP

NR PHY New Radio PHYsical

NR RLC New Radio RLC

NR RRC New Radio RRC

NSSAI Network Slice Selection Assistance Information

O&M Operation and Maintenance

OFDM orthogonal Frequency Division Multiplexing

PBCH Physical Broadcast CHannel

PCC Primary Component Carrier

PCCH Paging Control CHannel

PCell Primary Cell

PCH Paging CHannel

PDCCH Physical Downlink Control CHannel

PDCP Packet Data Convergence Protocol

PDSCH Physical Downlink Shared CHannel

PDU Protocol Data Unit

PHICH Physical HARQ Indicator CHannel

PHY PHYsical

PLMN Public Land Mobile Network

PMI Precoding Matrix Indicator

PRACH Physical Random Access CHannel

PRB Physical Resource Block

PSCell Primary Secondary Cell

PSS Primary Synchronization Signal

pTAG primary Timing Advance Group

PT-RS Phase Tracking Reference Signal

PUCCH Physical Uplink Control CHannel

PUSCH Physical Uplink Shared CHannel

QAM Quadrature Amplitude Modulation

QFI Quality of Service Indicator

QoS Quality of Service

QPSK Quadrature Phase Shift Keying

RA Random Access

RACH Random Access CHannel

RAN Radio Access Network

RAT Radio Access Technology

RA-RNTI Random Access-Radio Network Temporary Identifier

RB Resource Blocks

RBG Resource Block Groups

RI Rank indicator

RLC Radio Link Control

RLM Radio Link Monitoring

RRC Radio Resource Control

RS Reference Signal

RSRP Reference Signal Received Power

SCC Secondary Component Carrier

SCell Secondary Cell

SCG Secondary Cell Group

SC-FDMA Single Carrier-Frequency Division Multiple Access

SDAP Service Data Adaptation Protocol

SDU Service Data Unit

SeNB Secondary evolved Node B

SFN System Frame Number

S-GW Serving GateWay

SI System Information

SIB System Information Block

SMF Session Management Function

SN Secondary Node

SpCell Special Cell

SRB Signaling Radio Bearer

SRS Sounding Reference Signal

SS Synchronization Signal

SSS Secondary Synchronization Signal

sTAG secondary Timing Advance Group

TA Timing Advance

TAG Timing Advance Group

TAI Tracking Area Identifier

TAT Time Alignment Timer

TB Transport Block

TC-RNTI Temporary Cell-Radio Network Temporary Identifier

TDD Time Division Duplex

TDMA Time Division Multiple Access

TTI Transmission Time Interval

UCI Uplink Control Information

UE User Equipment

UL Uplink

UL-SCH Uplink Shared CHannel

UPF User Plane Function

UPGW User Plane Gateway

VHDL VHSIC Hardware Description Language

Xn-C Xn-Control plane

Xn-U Xn-User plane

Example embodiments of the disclosure may be implemented using variousphysical layer modulation and transmission mechanisms. Exampletransmission mechanisms may include, but are not limited to: CodeDivision Multiple Access (CDMA), Orthogonal Frequency Division MultipleAccess (OFDMA), Time Division Multiple Access (TDMA), Wavelettechnologies, and/or the like. Hybrid transmission mechanisms such asTDMA/CDMA, and OFDM/CDMA may also be employed. Various modulationschemes may be applied for signal transmission in the physical layer.Examples of modulation schemes include, but are not limited to: phase,amplitude, code, a combination of these, and/or the like. An exampleradio transmission method may implement Quadrature Amplitude Modulation(QAM) using Binary Phase Shift Keying (BPSK), Quadrature Phase ShiftKeying (QPSK), 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and/or the like.Physical radio transmission may be enhanced by dynamically orsemi-dynamically changing the modulation and coding scheme depending ontransmission requirements and radio conditions.

FIG. 1 is an example Radio Access Network (RAN) architecture as per anaspect of an embodiment of the present disclosure. As illustrated inthis example, a RAN node may be a next generation Node B (gNB) (e.g.120A, 120B) providing New Radio (NR) user plane and control planeprotocol terminations towards a first wireless device (e.g. 110A). In anexample, a RAN node may be a next generation evolved Node B (ng-eNB)(e.g. 120C, 120D), providing Evolved UMTS Terrestrial Radio Access(E-UTRA) user plane and control plane protocol terminations towards asecond wireless device (e.g. 110B). The first wireless device maycommunicate with a gNB over a Uu interface. The second wireless devicemay communicate with a ng-eNB over a Uu interface.

A gNB or an ng-eNB may host functions such as radio resource managementand scheduling, IP header compression, encryption and integrityprotection of data, selection of Access and Mobility Management Function(AMF) at User Equipment (UE) attachment, routing of user plane andcontrol plane data, connection setup and release, scheduling andtransmission of paging messages (originated from the AMF), schedulingand transmission of system broadcast information (originated from theAMF or Operation and Maintenance (O&M)), measurement and measurementreporting configuration, transport level packet marking in the uplink,session management, support of network slicing, Quality of Service (QoS)flow management and mapping to data radio bearers, support of UEs inRRC_INACTIVE state, distribution function for Non-Access Stratum (NAS)messages, RAN sharing, dual connectivity or tight interworking betweenNR and E-UTRA.

In an example, one or more gNBs and/or one or more ng-eNBs may beinterconnected with each other by means of Xn interface. A gNB or anng-eNB may be connected by means of NG interfaces to 5G Core Network(5GC). In an example, 5GC may comprise one or more AMF/User PlanFunction (UPF) functions (e.g. 130A or 130B). A gNB or an ng-eNB may beconnected to a UPF by means of an NG-User plane (NG-U) interface. TheNG-U interface may provide delivery (e.g. non-guaranteed delivery) ofuser plane Protocol Data Units (PDUs) between a RAN node and the UPF. AgNB or an ng-eNB may be connected to an AMF by means of an NG-Controlplane (NG-C) interface. The NG-C interface may provide functions such asNG interface management, UE context management, UE mobility management,transport of NAS messages, paging, PDU session management, configurationtransfer or warning message transmission.

In an example, a UPF may host functions such as anchor point forintra-/inter-Radio Access Technology (RAT) mobility (when applicable),external PDU session point of interconnect to data network, packetrouting and forwarding, packet inspection and user plane part of policyrule enforcement, traffic usage reporting, uplink classifier to supportrouting traffic flows to a data network, branching point to supportmulti-homed PDU session, QoS handling for user plane, e.g. packetfiltering, gating, Uplink (UL)/Downlink (DL) rate enforcement, uplinktraffic verification (e.g. Service Data Flow (SDF) to QoS flow mapping),downlink packet buffering and/or downlink data notification triggering.

In an example, an AMF may host functions such as NAS signalingtermination, NAS signaling security, Access Stratum (AS) securitycontrol, inter Core Network (CN) node signaling for mobility between3^(rd) Generation Partnership Project (3GPP) access networks, idle modeUE reachability (e.g., control and execution of paging retransmission),registration area management, support of intra-system and inter-systemmobility, access authentication, access authorization including check ofroaming rights, mobility management control (subscription and policies),support of network slicing and/or Session Management Function (SMF)selection.

FIG. 2A is an example user plane protocol stack, where Service DataAdaptation Protocol (SDAP) (e.g. 211 and 221), Packet Data ConvergenceProtocol (PDCP) (e.g. 212 and 222), Radio Link Control (RLC) (e.g. 213and 223) and Media Access Control (MAC) (e.g. 214 and 224) sublayers andPhysical (PHY) (e.g. 215 and 225) layer may be terminated in wirelessdevice (e.g. 110) and gNB (e.g. 120) on the network side. In an example,a PHY layer provides transport services to higher layers (e.g. MAC, RRC,etc.). In an example, services and functions of a MAC sublayer maycomprise mapping between logical channels and transport channels,multiplexing/demultiplexing of MAC Service Data Units (SDUs) belongingto one or different logical channels into/from Transport Blocks (TB s)delivered to/from the PHY layer, scheduling information reporting, errorcorrection through Hybrid Automatic Repeat request (HARQ) (e.g. one HARQentity per carrier in case of Carrier Aggregation (CA)), priorityhandling between UEs by means of dynamic scheduling, priority handlingbetween logical channels of one UE by means of logical channelprioritization, and/or padding. A MAC entity may support one or multiplenumerologies and/or transmission timings. In an example, mappingrestrictions in a logical channel prioritization may control whichnumerology and/or transmission timing a logical channel may use. In anexample, an RLC sublayer may supports transparent mode (TM),unacknowledged mode (UM) and acknowledged mode (AM) transmission modes.The RLC configuration may be per logical channel with no dependency onnumerologies and/or Transmission Time Interval (TTI) durations. In anexample, Automatic Repeat Request (ARQ) may operate on any of thenumerologies and/or TTI durations the logical channel is configuredwith. In an example, services and functions of the PDCP layer for theuser plane may comprise sequence numbering, header compression anddecompression, transfer of user data, reordering and duplicatedetection, PDCP PDU routing (e.g. in case of split bearers),retransmission of PDCP SDUs, ciphering, deciphering and integrityprotection, PDCP SDU discard, PDCP re-establishment and data recoveryfor RLC AM, and/or duplication of PDCP PDUs. In an example, services andfunctions of SDAP may comprise mapping between a QoS flow and a dataradio bearer. In an example, services and functions of SDAP may comprisemapping Quality of Service Indicator (QFI) in DL and UL packets. In anexample, a protocol entity of SDAP may be configured for an individualPDU session.

FIG. 2B is an example control plane protocol stack where PDCP (e.g. 233and 242), RLC (e.g. 234 and 243) and MAC (e.g. 235 and 244) sublayersand PHY (e.g. 236 and 245) layer may be terminated in wireless device(e.g. 110) and gNB (e.g. 120) on a network side and perform service andfunctions described above. In an example, RRC (e.g. 232 and 241) may beterminated in a wireless device and a gNB on a network side. In anexample, services and functions of RRC may comprise broadcast of systeminformation related to AS and NAS, paging initiated by 5GC or RAN,establishment, maintenance and release of an RRC connection between theUE and RAN, security functions including key management, establishment,configuration, maintenance and release of Signaling Radio Bearers (SRBs)and Data Radio Bearers (DRBs), mobility functions, QoS managementfunctions, UE measurement reporting and control of the reporting,detection of and recovery from radio link failure, and/or NAS messagetransfer to/from NAS from/to a UE. In an example, NAS control protocol(e.g. 231 and 251) may be terminated in the wireless device and AMF(e.g. 130) on a network side and may perform functions such asauthentication, mobility management between a UE and a AMF for 3GPPaccess and non-3GPP access, and session management between a UE and aSMF for 3GPP access and non-3GPP access.

In an example, a base station may configure a plurality of logicalchannels for a wireless device. A logical channel in the plurality oflogical channels may correspond to a radio bearer and the radio bearermay be associated with a QoS requirement. In an example, a base stationmay configure a logical channel to be mapped to one or moreTTIs/numerologies in a plurality of TTIs/numerologies. The wirelessdevice may receive a Downlink Control Information (DCI) via PhysicalDownlink Control CHannel (PDCCH) indicating an uplink grant. In anexample, the uplink grant may be for a first TTI/numerology and mayindicate uplink resources for transmission of a transport block. Thebase station may configure each logical channel in the plurality oflogical channels with one or more parameters to be used by a logicalchannel prioritization procedure at the MAC layer of the wirelessdevice. The one or more parameters may comprise priority, prioritizedbit rate, etc. A logical channel in the plurality of logical channelsmay correspond to one or more buffers comprising data associated withthe logical channel. The logical channel prioritization procedure mayallocate the uplink resources to one or more first logical channels inthe plurality of logical channels and/or one or more MAC ControlElements (CEs). The one or more first logical channels may be mapped tothe first TTI/numerology. The MAC layer at the wireless device maymultiplex one or more MAC CEs and/or one or more MAC SDUs (e.g., logicalchannel) in a MAC PDU (e.g., transport block). In an example, the MACPDU may comprise a MAC header comprising a plurality of MAC sub-headers.A MAC sub-header in the plurality of MAC sub-headers may correspond to aMAC CE or a MAC SUD (logical channel) in the one or more MAC CEs and/orone or more MAC SDUs. In an example, a MAC CE or a logical channel maybe configured with a Logical Channel IDentifier (LCID). In an example,LCID for a logical channel or a MAC CE may be fixed/pre-configured. Inan example, LCID for a logical channel or MAC CE may be configured forthe wireless device by the base station. The MAC sub-headercorresponding to a MAC CE or a MAC SDU may comprise LCID associated withthe MAC CE or the MAC SDU.

In an example, a base station may activate and/or deactivate and/orimpact one or more processes (e.g., set values of one or more parametersof the one or more processes or start and/or stop one or more timers ofthe one or more processes) at the wireless device by employing one ormore MAC commands. The one or more MAC commands may comprise one or moreMAC control elements. In an example, the one or more processes maycomprise activation and/or deactivation of PDCP packet duplication forone or more radio bearers. The base station may transmit a MAC CEcomprising one or more fields, the values of the fields indicatingactivation and/or deactivation of PDCP duplication for the one or moreradio bearers. In an example, the one or more processes may compriseChannel State Information (CSI) transmission of on one or more cells.The base station may transmit one or more MAC CEs indicating activationand/or deactivation of the CSI transmission on the one or more cells. Inan example, the one or more processes may comprise activation ordeactivation of one or more secondary cells. In an example, the basestation may transmit a MA CE indicating activation or deactivation ofone or more secondary cells. In an example, the base station maytransmit one or more MAC CEs indicating starting and/or stopping one ormore Discontinuous Reception (DRX) timers at the wireless device. In anexample, the base station may transmit one or more MAC CEs indicatingone or more timing advance values for one or more Timing Advance Groups(TAGs).

FIG. 3 is a block diagram of base stations (base station 1, 120A, andbase station 2, 120B) and a wireless device 110. A wireless device maybe called an UE. A base station may be called a NB, eNB, gNB, and/orng-eNB. In an example, a wireless device and/or a base station may actas a relay node. The base station 1, 120A, may comprise at least onecommunication interface 320A (e.g. a wireless modem, an antenna, a wiredmodem, and/or the like), at least one processor 321A, and at least oneset of program code instructions 323A stored in non-transitory memory322A and executable by the at least one processor 321A. The base station2, 120B, may comprise at least one communication interface 320B, atleast one processor 321B, and at least one set of program codeinstructions 323B stored in non-transitory memory 322B and executable bythe at least one processor 321B.

A base station may comprise many sectors for example: 1, 2, 3, 4, or 6sectors. A base station may comprise many cells, for example, rangingfrom 1 to 50 cells or more. A cell may be categorized, for example, as aprimary cell or secondary cell. At Radio Resource Control (RRC)connection establishment/re-establishment/handover, one serving cell mayprovide the NAS (non-access stratum) mobility information (e.g. TrackingArea Identifier (TAI)). At RRC connection re-establishment/handover, oneserving cell may provide the security input. This cell may be referredto as the Primary Cell (PCell). In the downlink, a carrier correspondingto the PCell may be a DL Primary Component Carrier (PCC), while in theuplink, a carrier may be an UL PCC. Depending on wireless devicecapabilities, Secondary Cells (SCells) may be configured to formtogether with a PCell a set of serving cells. In a downlink, a carriercorresponding to an SCell may be a downlink secondary component carrier(DL SCC), while in an uplink, a carrier may be an uplink secondarycomponent carrier (UL SCC). An SCell may or may not have an uplinkcarrier.

A cell, comprising a downlink carrier and optionally an uplink carrier,may be assigned a physical cell ID and a cell index. A carrier (downlinkor uplink) may belong to one cell. The cell ID or cell index may alsoidentify the downlink carrier or uplink carrier of the cell (dependingon the context it is used). In the disclosure, a cell ID may be equallyreferred to a carrier ID, and a cell index may be referred to a carrierindex. In an implementation, a physical cell ID or a cell index may beassigned to a cell. A cell ID may be determined using a synchronizationsignal transmitted on a downlink carrier. A cell index may be determinedusing RRC messages. For example, when the disclosure refers to a firstphysical cell ID for a first downlink carrier, the disclosure may meanthe first physical cell ID is for a cell comprising the first downlinkcarrier. The same concept may apply to, for example, carrier activation.When the disclosure indicates that a first carrier is activated, thespecification may equally mean that a cell comprising the first carrieris activated.

A base station may transmit to a wireless device one or more messages(e.g. RRC messages) comprising a plurality of configuration parametersfor one or more cells. One or more cells may comprise at least oneprimary cell and at least one secondary cell. In an example, an RRCmessage may be broadcasted or unicasted to the wireless device. In anexample, configuration parameters may comprise common parameters anddedicated parameters.

Services and/or functions of an RRC sublayer may comprise at least oneof: broadcast of system information related to AS and NAS; paginginitiated by 5GC and/or NG-RAN; establishment, maintenance, and/orrelease of an RRC connection between a wireless device and NG-RAN, whichmay comprise at least one of addition, modification and release ofcarrier aggregation; or addition, modification, and/or release of dualconnectivity in NR or between E-UTRA and NR. Services and/or functionsof an RRC sublayer may further comprise at least one of securityfunctions comprising key management; establishment, configuration,maintenance, and/or release of Signaling Radio Bearers (SRBs) and/orData Radio Bearers (DRBs); mobility functions which may comprise atleast one of a handover (e.g. intra NR mobility or inter-RAT mobility)and a context transfer; or a wireless device cell selection andreselection and control of cell selection and reselection. Servicesand/or functions of an RRC sublayer may further comprise at least one ofQoS management functions; a wireless device measurementconfiguration/reporting; detection of and/or recovery from radio linkfailure; or NAS message transfer to/from a core network entity (e.g.AMF, Mobility Management Entity (MME)) from/to the wireless device.

An RRC sublayer may support an RRC_Idle state, an RRC_Inactive stateand/or an RRC_Connected state for a wireless device. In an RRC_Idlestate, a wireless device may perform at least one of: Public Land MobileNetwork (PLMN) selection; receiving broadcasted system information; cellselection/re-selection; monitoring/receiving a paging for mobileterminated data initiated by 5GC; paging for mobile terminated data areamanaged by 5GC; or DRX for CN paging configured via NAS. In anRRC_Inactive state, a wireless device may perform at least one of:receiving broadcasted system information; cell selection/re-selection;monitoring/receiving a RAN/CN paging initiated by NG-RAN/5GC; RAN-basednotification area (RNA) managed by NG-RAN; or DRX for RAN/CN pagingconfigured by NG-RAN/NAS. In an RRC_Idle state of a wireless device, abase station (e.g. NG-RAN) may keep a 5GC-NG-RAN connection (bothC/U-planes) for the wireless device; and/or store a UE AS context forthe wireless device. In an RRC Connected state of a wireless device, abase station (e.g. NG-RAN) may perform at least one of: establishment of5GC-NG-RAN connection (both C/U-planes) for the wireless device; storinga UE AS context for the wireless device; transmit/receive of unicastdata to/from the wireless device; or network-controlled mobility basedon measurement results received from the wireless device. In anRRC_Connected state of a wireless device, an NG-RAN may know a cell thatthe wireless device belongs to.

System information (SI) may be divided into minimum SI and other SI. Theminimum SI may be periodically broadcast. The minimum SI may comprisebasic information required for initial access and information foracquiring any other SI broadcast periodically or provisioned on-demand,i.e. scheduling information. The other SI may either be broadcast, or beprovisioned in a dedicated manner, either triggered by a network or uponrequest from a wireless device. A minimum SI may be transmitted via twodifferent downlink channels using different messages (e.g.MasterInformationBlock and SystemInformationBlockType1). Another SI maybe transmitted via SystemInformationBlockType2. For a wireless device inan RRC_Connected state, dedicated RRC signalling may be employed for therequest and delivery of the other SI. For the wireless device in theRRC_Idle state and/or the RRC_Inactive state, the request may trigger arandom-access procedure.

A wireless device may report its radio access capability informationwhich may be static. A base station may request what capabilities for awireless device to report based on band information. When allowed by anetwork, a temporary capability restriction request may be sent by thewireless device to signal the limited availability of some capabilities(e.g. due to hardware sharing, interference or overheating) to the basestation. The base station may confirm or reject the request. Thetemporary capability restriction may be transparent to 5GC (e.g., staticcapabilities may be stored in 5GC).

When CA is configured, a wireless device may have an RRC connection witha network. At RRC connection establishment/re-establishment/handoverprocedure, one serving cell may provide NAS mobility information, and atRRC connection re-establishment/handover, one serving cell may provide asecurity input. This cell may be referred to as the PCell. Depending onthe capabilities of the wireless device, SCells may be configured toform together with the PCell a set of serving cells. The configured setof serving cells for the wireless device may comprise one PCell and oneor more SCells.

The reconfiguration, addition and removal of SCells may be performed byRRC. At intra-NR handover, RRC may also add, remove, or reconfigureSCells for usage with the target PCell. When adding a new SCell,dedicated RRC signalling may be employed to send all required systeminformation of the SCell i.e. while in connected mode, wireless devicesmay not need to acquire broadcasted system information directly from theSCells.

The purpose of an RRC connection reconfiguration procedure may be tomodify an RRC connection, (e.g. to establish, modify and/or release RBs,to perform handover, to setup, modify, and/or release measurements, toadd, modify, and/or release SCells and cell groups). As part of the RRCconnection reconfiguration procedure, NAS dedicated information may betransferred from the network to the wireless device. TheRRCConnectionReconfiguration message may be a command to modify an RRCconnection. It may convey information for measurement configuration,mobility control, radio resource configuration (e.g. RBs, MAC mainconfiguration and physical channel configuration) comprising anyassociated dedicated NAS information and security configuration. If thereceived RRC Connection Reconfiguration message includes thesCellToReleaseList, the wireless device may perform an SCell release. Ifthe received RRC Connection Reconfiguration message includes thesCellToAddModList, the wireless device may perform SCell additions ormodification.

An RRC connection establishment (or reestablishment, resume) proceduremay be to establish (or reestablish, resume) an RRC connection. an RRCconnection establishment procedure may comprise SRB1 establishment. TheRRC connection establishment procedure may be used to transfer theinitial NAS dedicated information/message from a wireless device toE-UTRAN. The RRCConnectionReestablishment message may be used tore-establish SRB1.

A measurement report procedure may be to transfer measurement resultsfrom a wireless device to NG-RAN. The wireless device may initiate ameasurement report procedure after successful security activation. Ameasurement report message may be employed to transmit measurementresults.

The wireless device 110 may comprise at least one communicationinterface 310 (e.g. a wireless modem, an antenna, and/or the like), atleast one processor 314, and at least one set of program codeinstructions 316 stored in non-transitory memory 315 and executable bythe at least one processor 314. The wireless device 110 may furthercomprise at least one of at least one speaker/microphone 311, at leastone keypad 312, at least one display/touchpad 313, at least one powersource 317, at least one global positioning system (GPS) chipset 318,and other peripherals 319.

The processor 314 of the wireless device 110, the processor 321A of thebase station 1 120A, and/or the processor 321B of the base station 2120B may comprise at least one of a general-purpose processor, a digitalsignal processor (DSP), a controller, a microcontroller, an applicationspecific integrated circuit (ASIC), a field programmable gate array(FPGA) and/or other programmable logic device, discrete gate and/ortransistor logic, discrete hardware components, and the like. Theprocessor 314 of the wireless device 110, the processor 321A in basestation 1 120A, and/or the processor 321B in base station 2 120B mayperform at least one of signal coding/processing, data processing, powercontrol, input/output processing, and/or any other functionality thatmay enable the wireless device 110, the base station 1 120A and/or thebase station 2 120B to operate in a wireless environment.

The processor 314 of the wireless device 110 may be connected to thespeaker/microphone 311, the keypad 312, and/or the display/touchpad 313.The processor 314 may receive user input data from and/or provide useroutput data to the speaker/microphone 311, the keypad 312, and/or thedisplay/touchpad 313. The processor 314 in the wireless device 110 mayreceive power from the power source 317 and/or may be configured todistribute the power to the other components in the wireless device 110.The power source 317 may comprise at least one of one or more dry cellbatteries, solar cells, fuel cells, and the like. The processor 314 maybe connected to the GPS chipset 318. The GPS chipset 318 may beconfigured to provide geographic location information of the wirelessdevice 110.

The processor 314 of the wireless device 110 may further be connected toother peripherals 319, which may comprise one or more software and/orhardware modules that provide additional features and/orfunctionalities. For example, the peripherals 319 may comprise at leastone of an accelerometer, a satellite transceiver, a digital camera, auniversal serial bus (USB) port, a hands-free headset, a frequencymodulated (FM) radio unit, a media player, an Internet browser, and thelike.

The communication interface 320A of the base station 1, 120A, and/or thecommunication interface 320B of the base station 2, 120B, may beconfigured to communicate with the communication interface 310 of thewireless device 110 via a wireless link 330A and/or a wireless link 330Brespectively. In an example, the communication interface 320A of thebase station 1, 120A, may communicate with the communication interface320B of the base station 2 and other RAN and core network nodes.

The wireless link 330A and/or the wireless link 330B may comprise atleast one of a bi-directional link and/or a directional link. Thecommunication interface 310 of the wireless device 110 may be configuredto communicate with the communication interface 320A of the base station1 120A and/or with the communication interface 320B of the base station2 120B. The base station 1 120A and the wireless device 110 and/or thebase station 2 120B and the wireless device 110 may be configured tosend and receive transport blocks via the wireless link 330A and/or viathe wireless link 330B, respectively. The wireless link 330A and/or thewireless link 330B may employ at least one frequency carrier. Accordingto some of various aspects of embodiments, transceiver(s) may beemployed. A transceiver may be a device that comprises both atransmitter and a receiver. Transceivers may be employed in devices suchas wireless devices, base stations, relay nodes, and/or the like.Example embodiments for radio technology implemented in thecommunication interface 310, 320A, 320B and the wireless link 330A, 330Bare illustrated in FIG. 4A, FIG. 4B, FIG. 4C, FIG. 4D, FIG. 6, FIG. 7A,FIG. 7B, FIG. 8, and associated text.

In an example, other nodes in a wireless network (e.g. AMF, UPF, SMF,etc.) may comprise one or more communication interfaces, one or moreprocessors, and memory storing instructions.

A node (e.g. wireless device, base station, AMF, SMF, UPF, servers,switches, antennas, and/or the like) may comprise one or moreprocessors, and memory storing instructions that when executed by theone or more processors causes the node to perform certain processesand/or functions. Example embodiments may enable operation ofsingle-carrier and/or multi-carrier communications. Other exampleembodiments may comprise a non-transitory tangible computer readablemedia comprising instructions executable by one or more processors tocause operation of single-carrier and/or multi-carrier communications.Yet other example embodiments may comprise an article of manufacturethat comprises a non-transitory tangible computer readablemachine-accessible medium having instructions encoded thereon forenabling programmable hardware to cause a node to enable operation ofsingle-carrier and/or multi-carrier communications. The node may includeprocessors, memory, interfaces, and/or the like.

An interface may comprise at least one of a hardware interface, afirmware interface, a software interface, and/or a combination thereof.The hardware interface may comprise connectors, wires, electronicdevices such as drivers, amplifiers, and/or the like. The softwareinterface may comprise code stored in a memory device to implementprotocol(s), protocol layers, communication drivers, device drivers,combinations thereof, and/or the like. The firmware interface maycomprise a combination of embedded hardware and code stored in and/or incommunication with a memory device to implement connections, electronicdevice operations, protocol(s), protocol layers, communication drivers,device drivers, hardware operations, combinations thereof, and/or thelike.

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplinkand downlink signal transmission as per an aspect of an embodiment ofthe present disclosure. FIG. 4A shows an example uplink transmitter forat least one physical channel. A baseband signal representing a physicaluplink shared channel may perform one or more functions. The one or morefunctions may comprise at least one of: scrambling; modulation ofscrambled bits to generate complex-valued symbols; mapping of thecomplex-valued modulation symbols onto one or several transmissionlayers; transform precoding to generate complex-valued symbols;precoding of the complex-valued symbols; mapping of precodedcomplex-valued symbols to resource elements; generation ofcomplex-valued time-domain Single Carrier-Frequency Division MultipleAccess (SC-FDMA) or CP-OFDM signal for an antenna port; and/or the like.In an example, when transform precoding is enabled, a SC-FDMA signal foruplink transmission may be generated. In an example, when transformprecoding is not enabled, an CP-OFDM signal for uplink transmission maybe generated by FIG. 4A. These functions are illustrated as examples andit is anticipated that other mechanisms may be implemented in variousembodiments.

An example structure for modulation and up-conversion to the carrierfrequency of the complex-valued SC-FDMA or CP-OFDM baseband signal foran antenna port and/or the complex-valued Physical Random Access CHannel(PRACH) baseband signal is shown in FIG. 4B. Filtering may be employedprior to transmission.

An example structure for downlink transmissions is shown in FIG. 4C. Thebaseband signal representing a downlink physical channel may perform oneor more functions. The one or more functions may comprise: scrambling ofcoded bits in a codeword to be transmitted on a physical channel;modulation of scrambled bits to generate complex-valued modulationsymbols; mapping of the complex-valued modulation symbols onto one orseveral transmission layers; precoding of the complex-valued modulationsymbols on a layer for transmission on the antenna ports; mapping ofcomplex-valued modulation symbols for an antenna port to resourceelements; generation of complex-valued time-domain OFDM signal for anantenna port; and/or the like. These functions are illustrated asexamples and it is anticipated that other mechanisms may be implementedin various embodiments.

In an example, a gNB may transmit a first symbol and a second symbol onan antenna port, to a wireless device. The wireless device may infer thechannel (e.g., fading gain, multipath delay, etc.) for conveying thesecond symbol on the antenna port, from the channel for conveying thefirst symbol on the antenna port. In an example, a first antenna portand a second antenna port may be quasi co-located if one or morelarge-scale properties of the channel over which a first symbol on thefirst antenna port is conveyed may be inferred from the channel overwhich a second symbol on a second antenna port is conveyed. The one ormore large-scale properties may comprise at least one of: delay spread;doppler spread; doppler shift; average gain; average delay; and/orspatial Receiving (Rx) parameters.

An example modulation and up-conversion to the carrier frequency of thecomplex-valued OFDM baseband signal for an antenna port is shown in FIG.4D. Filtering may be employed prior to transmission.

FIG. 5A is a diagram of an example uplink channel mapping and exampleuplink physical signals. FIG. 5B is a diagram of an example downlinkchannel mapping and a downlink physical signals. In an example, aphysical layer may provide one or more information transfer services toa MAC and/or one or more higher layers. For example, the physical layermay provide the one or more information transfer services to the MAC viaone or more transport channels. An information transfer service mayindicate how and with what characteristics data are transferred over theradio interface.

In an example embodiment, a radio network may comprise one or moredownlink and/or uplink transport channels. For example, a diagram inFIG. 5A shows example uplink transport channels comprising Uplink-SharedCHannel (UL-SCH) 501 and Random Access CHannel (RACH) 502. A diagram inFIG. 5B shows example downlink transport channels comprisingDownlink-Shared CHannel (DL-SCH) 511, Paging CHannel (PCH) 512, andBroadcast CHannel (BCH) 513. A transport channel may be mapped to one ormore corresponding physical channels. For example, UL-SCH 501 may bemapped to Physical Uplink Shared CHannel (PUSCH) 503. RACH 502 may bemapped to PRACH 505. DL-SCH 511 and PCH 512 may be mapped to PhysicalDownlink Shared CHannel (PDSCH) 514. BCH 513 may be mapped to PhysicalBroadcast CHannel (PBCH) 516.

There may be one or more physical channels without a correspondingtransport channel. The one or more physical channels may be employed forUplink Control Information (UCI) 509 and/or Downlink Control Information(DCI) 517. For example, Physical Uplink Control CHannel (PUCCH) 504 maycarry UCI 509 from a UE to a base station. For example, PhysicalDownlink Control CHannel (PDCCH) 515 may carry DCI 517 from a basestation to a UE. NR may support UCI 509 multiplexing in PUSCH 503 whenUCI 509 and PUSCH 503 transmissions may coincide in a slot at least inpart. The UCI 509 may comprise at least one of CSI, Acknowledgement(ACK)/Negative Acknowledgement (NACK), and/or scheduling request. TheDCI 517 on PDCCH 515 may indicate at least one of following: one or moredownlink assignments and/or one or more uplink scheduling grants

In uplink, a UE may transmit one or more Reference Signals (RSs) to abase station. For example, the one or more RSs may be at least one ofDemodulation-RS (DM-RS) 506, Phase Tracking-RS (PT-RS) 507, and/orSounding RS (SRS) 508. In downlink, a base station may transmit (e.g.,unicast, multicast, and/or broadcast) one or more RSs to a UE. Forexample, the one or more RSs may be at least one of PrimarySynchronization Signal (PSS)/Secondary Synchronization Signal (SSS) 521,CSI-RS 522, DM-RS 523, and/or PT-RS 524.

In an example, a UE may transmit one or more uplink DM-RSs 506 to a basestation for channel estimation, for example, for coherent demodulationof one or more uplink physical channels (e.g., PUSCH 503 and/or PUCCH504). For example, a UE may transmit a base station at least one uplinkDM-RS 506 with PUSCH 503 and/or PUCCH 504, wherein the at least oneuplink DM-RS 506 may be spanning a same frequency range as acorresponding physical channel. In an example, a base station mayconfigure a UE with one or more uplink DM-RS configurations. At leastone DM-RS configuration may support a front-loaded DM-RS pattern. Afront-loaded DM-RS may be mapped over one or more OFDM symbols (e.g., 1or 2 adjacent OFDM symbols). One or more additional uplink DM-RS may beconfigured to transmit at one or more symbols of a PUSCH and/or PUCCH. Abase station may semi-statistically configure a UE with a maximum numberof front-loaded DM-RS symbols for PUSCH and/or PUCCH. For example, a UEmay schedule a single-symbol DM-RS and/or double symbol DM-RS based on amaximum number of front-loaded DM-RS symbols, wherein a base station mayconfigure the UE with one or more additional uplink DM-RS for PUSCHand/or PUCCH. A new radio network may support, e.g., at least forCP-OFDM, a common DM-RS structure for DL and UL, wherein a DM-RSlocation, DM-RS pattern, and/or scrambling sequence may be same ordifferent.

In an example, whether uplink PT-RS 507 is present or not may depend ona RRC configuration. For example, a presence of uplink PT-RS may beUE-specifically configured. For example, a presence and/or a pattern ofuplink PT-RS 507 in a scheduled resource may be UE-specificallyconfigured by a combination of RRC signaling and/or association with oneor more parameters employed for other purposes (e.g., Modulation andCoding Scheme (MCS)) which may be indicated by DCI. When configured, adynamic presence of uplink PT-RS 507 may be associated with one or moreDCI parameters comprising at least MCS. A radio network may supportplurality of uplink PT-RS densities defined in time/frequency domain.When present, a frequency domain density may be associated with at leastone configuration of a scheduled bandwidth. A UE may assume a sameprecoding for a DMRS port and a PT-RS port. A number of PT-RS ports maybe fewer than a number of DM-RS ports in a scheduled resource. Forexample, uplink PT-RS 507 may be confined in the scheduledtime/frequency duration for a UE.

In an example, a UE may transmit SRS 508 to a base station for channelstate estimation to support uplink channel dependent scheduling and/orlink adaptation. For example, SRS 508 transmitted by a UE may allow fora base station to estimate an uplink channel state at one or moredifferent frequencies. A base station scheduler may employ an uplinkchannel state to assign one or more resource blocks of good quality foran uplink PUSCH transmission from a UE. A base station maysemi-statistically configure a UE with one or more SRS resource sets.For an SRS resource set, a base station may configure a UE with one ormore SRS resources. An SRS resource set applicability may be configuredby a higher layer (e.g., RRC) parameter. For example, when a higherlayer parameter indicates beam management, a SRS resource in each of oneor more SRS resource sets may be transmitted at a time instant. A UE maytransmit one or more SRS resources in different SRS resource setssimultaneously. A new radio network may support aperiodic, periodicand/or semi-persistent SRS transmissions. A UE may transmit SRSresources based on one or more trigger types, wherein the one or moretrigger types may comprise higher layer signaling (e.g., RRC) and/or oneor more DCI formats (e.g., at least one DCI format may be employed for aUE to select at least one of one or more configured SRS resource sets.An SRS trigger type 0 may refer to an SRS triggered based on a higherlayer signaling. An SRS trigger type 1 may refer to an SRS triggeredbased on one or more DCI formats. In an example, when PUSCH 503 and SRS508 are transmitted in a same slot, a UE may be configured to transmitSRS 508 after a transmission of PUSCH 503 and corresponding uplink DM-RS506.

In an example, a base station may semi-statistically configure a UE withone or more SRS configuration parameters indicating at least one offollowing: a SRS resource configuration identifier, a number of SRSports, time domain behavior of SRS resource configuration (e.g., anindication of periodic, semi-persistent, or aperiodic SRS), slot(mini-slot, and/or subframe) level periodicity and/or offset for aperiodic and/or aperiodic SRS resource, a number of OFDM symbols in aSRS resource, starting OFDM symbol of a SRS resource, a SRS bandwidth, afrequency hopping bandwidth, a cyclic shift, and/or a SRS sequence ID.

In an example, in a time domain, an SS/PBCH block may comprise one ormore OFDM symbols (e.g., 4 OFDM symbols numbered in increasing orderfrom 0 to 3) within the SS/PBCH block. An SS/PBCH block may comprisePSS/SSS 521 and PBCH 516. In an example, in the frequency domain, anSS/PBCH block may comprise one or more contiguous subcarriers (e.g., 240contiguous subcarriers with the subcarriers numbered in increasing orderfrom 0 to 239) within the SS/PBCH block. For example, a PSS/SSS 521 mayoccupy 1 OFDM symbol and 127 subcarriers. For example, PBCH 516 may spanacross 3 OFDM symbols and 240 subcarriers. A UE may assume that one ormore SS/PBCH blocks transmitted with a same block index may be quasico-located, e.g., with respect to Doppler spread, Doppler shift, averagegain, average delay, and spatial Rx parameters. A UE may not assumequasi co-location for other SS/PBCH block transmissions. A periodicityof an SS/PBCH block may be configured by a radio network (e.g., by anRRC signaling) and one or more time locations where the SS/PBCH blockmay be sent may be determined by sub-carrier spacing. In an example, aUE may assume a band-specific sub-carrier spacing for an SS/PBCH blockunless a radio network has configured a UE to assume a differentsub-carrier spacing.

In an example, downlink CSI-RS 522 may be employed for a UE to acquirechannel state information. A radio network may support periodic,aperiodic, and/or semi-persistent transmission of downlink CSI-RS 522.For example, a base station may semi-statistically configure and/orreconfigure a UE with periodic transmission of downlink CSI-RS 522. Aconfigured CSI-RS resources may be activated ad/or deactivated. Forsemi-persistent transmission, an activation and/or deactivation ofCSI-RS resource may be triggered dynamically. In an example, CSI-RSconfiguration may comprise one or more parameters indicating at least anumber of antenna ports. For example, a base station may configure a UEwith 32 ports. A base station may semi-statistically configure a UE withone or more CSI-RS resource sets. One or more CSI-RS resources may beallocated from one or more CSI-RS resource sets to one or more UEs. Forexample, a base station may semi-statistically configure one or moreparameters indicating CSI RS resource mapping, for example, time-domainlocation of one or more CSI-RS resources, a bandwidth of a CSI-RSresource, and/or a periodicity. In an example, a UE may be configured toemploy a same OFDM symbols for downlink CSI-RS 522 and control resourceset (coreset) when the downlink CSI-RS 522 and coreset are spatiallyquasi co-located and resource elements associated with the downlinkCSI-RS 522 are the outside of PRBs configured for coreset. In anexample, a UE may be configured to employ a same OFDM symbols fordownlink CSI-RS 522 and SS/PBCH blocks when the downlink CSI-RS 522 andSS/PBCH blocks are spatially quasi co-located and resource elementsassociated with the downlink CSI-RS 522 are the outside of PRBsconfigured for SS/PBCH blocks.

In an example, a UE may transmit one or more downlink DM-RSs 523 to abase station for channel estimation, for example, for coherentdemodulation of one or more downlink physical channels (e.g., PDSCH514). For example, a radio network may support one or more variableand/or configurable DM-RS patterns for data demodulation. At least onedownlink DM-RS configuration may support a front-loaded DM-RS pattern. Afront-loaded DM-RS may be mapped over one or more OFDM symbols (e.g., 1or 2 adjacent OFDM symbols). A base station may semi-statisticallyconfigure a UE with a maximum number of front-loaded DM-RS symbols forPDSCH 514. For example, a DM-RS configuration may support one or moreDM-RS ports. For example, for single user-MIMO, a DM-RS configurationmay support at least 8 orthogonal downlink DM-RS ports. For example, formultiuser-MIMO, a DM-RS configuration may support 12 orthogonal downlinkDM-RS ports. A radio network may support, e.g., at least for CP-OFDM, acommon DM-RS structure for DL and UL, wherein a DM-RS location, DM-RSpattern, and/or scrambling sequence may be same or different.

In an example, whether downlink PT-RS 524 is present or not may dependon a RRC configuration. For example, a presence of downlink PT-RS 524may be UE-specifically configured. For example, a presence and/or apattern of downlink PT-RS 524 in a scheduled resource may beUE-specifically configured by a combination of RRC signaling and/orassociation with one or more parameters employed for other purposes(e.g., MCS) which may be indicated by DCI. When configured, a dynamicpresence of downlink PT-RS 524 may be associated with one or more DCIparameters comprising at least MCS. A radio network may supportplurality of PT-RS densities defined in time/frequency domain. Whenpresent, a frequency domain density may be associated with at least oneconfiguration of a scheduled bandwidth. A UE may assume a same precodingfor a DMRS port and a PT-RS port. A number of PT-RS ports may be fewerthan a number of DM-RS ports in a scheduled resource. For example,downlink PT-RS 524 may be confined in the scheduled time/frequencyduration for a UE.

FIG. 6 is a diagram depicting an example transmission time and receptiontime for a carrier as per an aspect of an embodiment of the presentdisclosure. A multicarrier OFDM communication system may include one ormore carriers, for example, ranging from 1 to 32 carriers, in case ofcarrier aggregation, or ranging from 1 to 64 carriers, in case of dualconnectivity. Different radio frame structures may be supported (e.g.,for FDD and for TDD duplex mechanisms). FIG. 6 shows an example frametiming. Downlink and uplink transmissions may be organized into radioframes 601. In this example, radio frame duration is 10 ms. In thisexample, a 10 ms radio frame 601 may be divided into ten equally sizedsubframes 602 with 1 ms duration. Subframe(s) may comprise one or moreslots (e.g. slots 603 and 605) depending on subcarrier spacing and/or CPlength. For example, a subframe with 15 kHz, 30 kHz, 60 kHz, 120 kHz,240 kHz and 480 kHz subcarrier spacing may comprise one, two, four,eight, sixteen and thirty-two slots, respectively. In FIG. 6, a subframemay be divided into two equally sized slots 603 with 0.5 ms duration.For example, 10 subframes may be available for downlink transmission and10 subframes may be available for uplink transmissions in a 10 msinterval. Uplink and downlink transmissions may be separated in thefrequency domain. Slot(s) may include a plurality of OFDM symbols 604.The number of OFDM symbols 604 in a slot 605 may depend on the cyclicprefix length. For example, a slot may be 14 OFDM symbols for the samesubcarrier spacing of up to 480 kHz with normal CP. A slot may be 12OFDM symbols for the same subcarrier spacing of 60 kHz with extended CP.A slot may contain downlink, uplink, or a downlink part and an uplinkpart and/or alike.

FIG. 7A is a diagram depicting example sets of OFDM subcarriers as peran aspect of an embodiment of the present disclosure. In the example, agNB may communicate with a wireless device with a carrier with anexample channel bandwidth 700. Arrow(s) in the diagram may depict asubcarrier in a multicarrier OFDM system. The OFDM system may usetechnology such as OFDM technology, SC-FDMA technology, and/or the like.In an example, an arrow 701 shows a subcarrier transmitting informationsymbols. In an example, a subcarrier spacing 702, between two contiguoussubcarriers in a carrier, may be any one of 15 KHz, 30 KHz, 60 KHz, 120KHz, 240 KHz etc. In an example, different subcarrier spacing maycorrespond to different transmission numerologies. In an example, atransmission numerology may comprise at least: a numerology index; avalue of subcarrier spacing; a type of cyclic prefix (CP). In anexample, a gNB may transmit to/receive from a UE on a number ofsubcarriers 703 in a carrier. In an example, a bandwidth occupied by anumber of subcarriers 703 (transmission bandwidth) may be smaller thanthe channel bandwidth 700 of a carrier, due to guard band 704 and 705.In an example, a guard band 704 and 705 may be used to reduceinterference to and from one or more neighbor carriers. A number ofsubcarriers (transmission bandwidth) in a carrier may depend on thechannel bandwidth of the carrier and the subcarrier spacing. Forexample, a transmission bandwidth, for a carrier with 20 MHz channelbandwidth and 15 KHz subcarrier spacing, may be in number of 1024subcarriers.

In an example, a gNB and a wireless device may communicate with multipleCCs when configured with CA. In an example, different component carriersmay have different bandwidth and/or subcarrier spacing, if CA issupported. In an example, a gNB may transmit a first type of service toa UE on a first component carrier. The gNB may transmit a second type ofservice to the UE on a second component carrier. Different type ofservices may have different service requirement (e.g., data rate,latency, reliability), which may be suitable for transmission viadifferent component carrier having different subcarrier spacing and/orbandwidth. FIG. 7B shows an example embodiment. A first componentcarrier may comprise a first number of subcarriers 706 with a firstsubcarrier spacing 709. A second component carrier may comprise a secondnumber of subcarriers 707 with a second subcarrier spacing 710. A thirdcomponent carrier may comprise a third number of subcarriers 708 with athird subcarrier spacing 711. Carriers in a multicarrier OFDMcommunication system may be contiguous carriers, non-contiguouscarriers, or a combination of both contiguous and non-contiguouscarriers.

FIG. 8 is a diagram depicting OFDM radio resources as per an aspect ofan embodiment of the present disclosure. In an example, a carrier mayhave a transmission bandwidth 801. In an example, a resource grid may bein a structure of frequency domain 802 and time domain 803. In anexample, a resource grid may comprise a first number of OFDM symbols ina subframe and a second number of resource blocks, starting from acommon resource block indicated by higher-layer signaling (e.g. RRCsignaling), for a transmission numerology and a carrier. In an example,in a resource grid, a resource unit identified by a subcarrier index anda symbol index may be a resource element 805. In an example, a subframemay comprise a first number of OFDM symbols 807 depending on anumerology associated with a carrier. For example, when a subcarrierspacing of a numerology of a carrier is 15 KHz, a subframe may have 14OFDM symbols for a carrier. When a subcarrier spacing of a numerology is30 KHz, a subframe may have 28 OFDM symbols. When a subcarrier spacingof a numerology is 60 Khz, a subframe may have 56 OFDM symbols, etc. Inan example, a second number of resource blocks comprised in a resourcegrid of a carrier may depend on a bandwidth and a numerology of thecarrier.

As shown in FIG. 8, a resource block 806 may comprise 12 subcarriers. Inan example, multiple resource blocks may be grouped into a ResourceBlock Group (RBG) 804. In an example, a size of a RBG may depend on atleast one of: a RRC message indicating a RBG size configuration; a sizeof a carrier bandwidth; or a size of a bandwidth part of a carrier. Inan example, a carrier may comprise multiple bandwidth parts. A firstbandwidth part of a carrier may have different frequency location and/orbandwidth from a second bandwidth part of the carrier.

In an example, a gNB may transmit a downlink control informationcomprising a downlink or uplink resource block assignment to a wirelessdevice. A base station may transmit to or receive from, a wirelessdevice, data packets (e.g. transport blocks) scheduled and transmittedvia one or more resource blocks and one or more slots according toparameters in a downlink control information and/or RRC message(s). Inan example, a starting symbol relative to a first slot of the one ormore slots may be indicated to the wireless device. In an example, a gNBmay transmit to or receive from, a wireless device, data packetsscheduled on one or more RBGs and one or more slots.

In an example, a gNB may transmit a downlink control informationcomprising a downlink assignment to a wireless device via one or morePDCCHs. The downlink assignment may comprise parameters indicating atleast modulation and coding format; resource allocation; and/or HARQinformation related to DL-SCH. In an example, a resource allocation maycomprise parameters of resource block allocation; and/or slotallocation. In an example, a gNB may dynamically allocate resources to awireless device via a Cell-Radio Network Temporary Identifier (C-RNTI)on one or more PDCCHs. The wireless device may monitor the one or morePDCCHs in order to find possible allocation when its downlink receptionis enabled. The wireless device may receive one or more downlink datapackage on one or more PDSCH scheduled by the one or more PDCCHs, whensuccessfully detecting the one or more PDCCHs.

In an example, a gNB may allocate Configured Scheduling (CS) resourcesfor down link transmission to a wireless device. The gNB may transmitone or more RRC messages indicating a periodicity of the CS grant. ThegNB may transmit a DCI via a PDCCH addressed to a ConfiguredScheduling-RNTI (CS-RNTI) activating the CS resources. The DCI maycomprise parameters indicating that the downlink grant is a CS grant.The CS grant may be implicitly reused according to the periodicitydefined by the one or more RRC messages, until deactivated.

In an example, a gNB may transmit a downlink control informationcomprising an uplink grant to a wireless device via one or more PDCCHs.The uplink grant may comprise parameters indicating at least modulationand coding format; resource allocation; and/or HARQ information relatedto UL-SCH. In an example, a resource allocation may comprise parametersof resource block allocation; and/or slot allocation. In an example, agNB may dynamically allocate resources to a wireless device via a C-RNTIon one or more PDCCHs. The wireless device may monitor the one or morePDCCHs in order to find possible resource allocation. The wirelessdevice may transmit one or more uplink data package via one or morePUSCH scheduled by the one or more PDCCHs, when successfully detectingthe one or more PDCCHs.

In an example, a gNB may allocate CS resources for uplink datatransmission to a wireless device. The gNB may transmit one or more RRCmessages indicating a periodicity of the CS grant. The gNB may transmita DCI via a PDCCH addressed to a CS-RNTI activating the CS resources.The DCI may comprise parameters indicating that the uplink grant is a CSgrant. The CS grant may be implicitly reused according to theperiodicity defined by the one or more RRC message, until deactivated.

In an example, a base station may transmit DCI/control signaling viaPDCCH. The DCI may take a format in a plurality of formats. A DCI maycomprise downlink and/or uplink scheduling information (e.g., resourceallocation information, HARQ related parameters, MCS), request for CSI(e.g., aperiodic CQI reports), request for SRS, uplink power controlcommands for one or more cells, one or more timing information (e.g., TBtransmission/reception timing, HARQ feedback timing, etc.), etc. In anexample, a DCI may indicate an uplink grant comprising transmissionparameters for one or more transport blocks. In an example, a DCI mayindicate downlink assignment indicating parameters for receiving one ormore transport blocks. In an example, a DCI may be used by base stationto initiate a contention-free random access at the wireless device. Inan example, the base station may transmit a DCI comprising slot formatindicator (SFI) notifying a slot format. In an example, the base stationmay transmit a DCI comprising pre-emption indication notifying thePRB(s) and/or OFDM symbol(s) where a UE may assume no transmission isintended for the UE. In an example, the base station may transmit a DCIfor group power control of PUCCH or PUSCH or SRS. In an example, a DCImay correspond to an RNTI. In an example, the wireless device may obtainan RNTI in response to completing the initial access (e.g., C-RNTI). Inan example, the base station may configure an RNTI for the wireless(e.g., CS-RNTI, TPC-CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI,TPC-SRS-RNTI). In an example, the wireless device may compute an RNTI(e.g., the wireless device may compute RA-RNTI based on resources usedfor transmission of a preamble). In an example, an RNTI may have apre-configured value (e.g., P-RNTI or SI-RNTI). In an example, awireless device may monitor a group common search space which may beused by base station for transmitting DCIs that are intended for a groupof UEs. In an example, a group common DCI may correspond to an RNTIwhich is commonly configured for a group of UEs. In an example, awireless device may monitor a UE-specific search space. In an example, aUE specific DCI may correspond to an RNTI configured for the wirelessdevice.

A NR system may support a single beam operation and/or a multi-beamoperation. In a multi-beam operation, a base station may perform adownlink beam sweeping to provide coverage for common control channelsand/or downlink SS blocks, which may comprise at least a PSS, a SSS,and/or PBCH. A wireless device may measure quality of a beam pair linkusing one or more RSs. One or more SS blocks, or one or more CSI-RSresources, associated with a CSI-RS resource index (CRI), or one or moreDM-RSs of PBCH, may be used as RS for measuring quality of a beam pairlink. Quality of a beam pair link may be defined as a reference signalreceived power (RSRP) value, or a reference signal received quality(RSRQ) value, and/or a CSI value measured on RS resources. The basestation may indicate whether an RS resource, used for measuring a beampair link quality, is quasi-co-located (QCLed) with DM-RSs of a controlchannel. A RS resource and DM-RSs of a control channel may be calledQCLed when a channel characteristics from a transmission on an RS to awireless device, and that from a transmission on a control channel to awireless device, are similar or same under a configured criterion. In amulti-beam operation, a wireless device may perform an uplink beamsweeping to access a cell.

In an example, a wireless device may be configured to monitor PDCCH onone or more beam pair links simultaneously depending on a capability ofa wireless device. This may increase robustness against beam pair linkblocking. A base station may transmit one or more messages to configurea wireless device to monitor PDCCH on one or more beam pair links indifferent PDCCH OFDM symbols. For example, a base station may transmithigher layer signaling (e.g. RRC signaling) or MAC CE comprisingparameters related to the Rx beam setting of a wireless device formonitoring PDCCH on one or more beam pair links. A base station maytransmit indication of spatial QCL assumption between an DL RS antennaport(s) (for example, cell-specific CSI-RS, or wireless device-specificCSI-RS, or SS block, or PBCH with or without DM-RSs of PBCH), and DL RSantenna port(s) for demodulation of DL control channel. Signaling forbeam indication for a PDCCH may be MAC CE signaling, or RRC signaling,or DCI signaling, or specification-transparent and/or implicit method,and combination of these signaling methods.

For reception of unicast DL data channel, a base station may indicatespatial QCL parameters between DL RS antenna port(s) and DM-RS antennaport(s) of DL data channel. The base station may transmit DCI (e.g.downlink grants) comprising information indicating the RS antennaport(s). The information may indicate RS antenna port(s) which may beQCLed with the DM-RS antenna port(s). Different set of DM-RS antennaport(s) for a DL data channel may be indicated as QCL with different setof the RS antenna port(s).

FIG. 9A is an example of beam sweeping in a DL channel. In anRRC_INACTIVE state or RRC_IDLE state, a wireless device may assume thatSS blocks form an SS burst 940, and an SS burst set 950. The SS burstset 950 may have a given periodicity. For example, in a multi-beamoperation, a base station 120 may transmit SS blocks in multiple beams,together forming a SS burst 940. One or more SS blocks may betransmitted on one beam. If multiple SS bursts 940 are transmitted withmultiple beams, SS bursts together may form SS burst set 950.

A wireless device may further use CSI-RS in the multi-beam operation forestimating a beam quality of a links between a wireless device and abase station. A beam may be associated with a CSI-RS. For example, awireless device may, based on a RSRP measurement on CSI-RS, report abeam index, as indicated in a CRI for downlink beam selection, andassociated with a RSRP value of a beam. A CSI-RS may be transmitted on aCSI-RS resource including at least one of one or more antenna ports, oneor more time or frequency radio resources. A CSI-RS resource may beconfigured in a cell-specific way by common RRC signaling, or in awireless device-specific way by dedicated RRC signaling, and/or L1/L2signaling. Multiple wireless devices covered by a cell may measure acell-specific CSI-RS resource. A dedicated subset of wireless devicescovered by a cell may measure a wireless device-specific CSI-RSresource.

A CSI-RS resource may be transmitted periodically, or using aperiodictransmission, or using a multi-shot or semi-persistent transmission. Forexample, in a periodic transmission in FIG. 9A, a base station 120 maytransmit configured CSI-RS resources 940 periodically using a configuredperiodicity in a time domain. In an aperiodic transmission, a configuredCSI-RS resource may be transmitted in a dedicated time slot. In amulti-shot or semi-persistent transmission, a configured CSI-RS resourcemay be transmitted within a configured period. Beams used for CSI-RStransmission may have different beam width than beams used for SS-blockstransmission.

FIG. 9B is an example of a beam management procedure in an example newradio network. A base station 120 and/or a wireless device 110 mayperform a downlink L1/L2 beam management procedure. One or more of thefollowing downlink L1/L2 beam management procedures may be performedwithin one or more wireless devices 110 and one or more base stations120. In an example, a P-1 procedure 910 may be used to enable thewireless device 110 to measure one or more Transmission (Tx) beamsassociated with the base station 120 to support a selection of a firstset of Tx beams associated with the base station 120 and a first set ofRx beam(s) associated with a wireless device 110. For beamforming at abase station 120, a base station 120 may sweep a set of different TXbeams. For beamforming at a wireless device 110, a wireless device 110may sweep a set of different Rx beams. In an example, a P-2 procedure920 may be used to enable a wireless device 110 to measure one or moreTx beams associated with a base station 120 to possibly change a firstset of Tx beams associated with a base station 120. A P-2 procedure 920may be performed on a possibly smaller set of beams for beam refinementthan in the P-1 procedure 910. A P-2 procedure 920 may be a special caseof a P-1 procedure 910. In an example, a P-3 procedure 930 may be usedto enable a wireless device 110 to measure at least one Tx beamassociated with a base station 120 to change a first set of Rx beamsassociated with a wireless device 110.

A wireless device 110 may transmit one or more beam management reportsto a base station 120. In one or more beam management reports, awireless device 110 may indicate some beam pair quality parameters,comprising at least, one or more beam identifications; RSRP; PrecodingMatrix Indicator (PMI)/Channel Quality Indicator (CQI)/Rank Indicator(RI) of a subset of configured beams. Based on one or more beammanagement reports, a base station 120 may transmit to a wireless device110 a signal indicating that one or more beam pair links are one or moreserving beams. A base station 120 may transmit PDCCH and PDSCH for awireless device 110 using one or more serving beams.

In an example embodiment, new radio network may support a BandwidthAdaptation (BA). In an example, receive and/or transmit bandwidthsconfigured by an UE employing a BA may not be large. For example, areceive and/or transmit bandwidths may not be as large as a bandwidth ofa cell. Receive and/or transmit bandwidths may be adjustable. Forexample, a UE may change receive and/or transmit bandwidths, e.g., toshrink during period of low activity to save power. For example, a UEmay change a location of receive and/or transmit bandwidths in afrequency domain, e.g. to increase scheduling flexibility. For example,a UE may change a subcarrier spacing, e.g. to allow different services.

In an example embodiment, a subset of a total cell bandwidth of a cellmay be referred to as a Bandwidth Part (BWP). A base station mayconfigure a UE with one or more BWPs to achieve a BA. For example, abase station may indicate, to a UE, which of the one or more(configured) BWPs is an active BWP.

FIG. 10 is an example diagram of 3 BWPs configured: BWP1 (1010 and 1050)with a width of 40 MHz and subcarrier spacing of 15 kHz; BWP2 (1020 and1040) with a width of 10 MHz and subcarrier spacing of 15 kHz; BWP3 1030with a width of 20 MHz and subcarrier spacing of 60 kHz.

In an example, a UE, configured for operation in one or more BWPs of acell, may be configured by one or more higher layers (e.g. RRC layer)for a cell a set of one or more BWPs (e.g., at most four BWPs) forreceptions by the UE (DL BWP set) in a DL bandwidth by at least oneparameter DL-BWP and a set of one or more BWPs (e.g., at most four BWPs)for transmissions by a UE (UL BWP set) in an UL bandwidth by at leastone parameter UL-BWP for a cell.

To enable BA on the PCell, a base station may configure a UE with one ormore UL and DL BWP pairs. To enable BA on SCells (e.g., in case of CA),a base station may configure a UE at least with one or more DL BWPs(e.g., there may be none in an UL).

In an example, an initial active DL BWP may be defined by at least oneof a location and number of contiguous PRBs, a subcarrier spacing, or acyclic prefix, for a control resource set for at least one common searchspace. For operation on the PCell, one or more higher layer parametersmay indicate at least one initial UL BWP for a random access procedure.If a UE is configured with a secondary carrier on a primary cell, the UEmay be configured with an initial BWP for random access procedure on asecondary carrier.

In an example, for unpaired spectrum operation, a UE may expect that acenter frequency for a DL BWP may be same as a center frequency for a ULBWP.

For example, for a DL BWP or an UL BWP in a set of one or more DL BWPsor one or more UL BWPs, respectively, a base station maysemi-statistically configure a UE for a cell with one or more parametersindicating at least one of following: a subcarrier spacing; a cyclicprefix; a number of contiguous PRBs; an index in the set of one or moreDL BWPs and/or one or more UL BWPs; a link between a DL BWP and an ULBWP from a set of configured DL BWPs and UL BWPs; a DCI detection to aPDSCH reception timing; a PDSCH reception to a HARQ-ACK transmissiontiming value; a DCI detection to a PUSCH transmission timing value; anoffset of a first PRB of a DL bandwidth or an UL bandwidth,respectively, relative to a first PRB of a bandwidth.

In an example, for a DL BWP in a set of one or more DL BWPs on a PCell,a base station may configure a UE with one or more control resource setsfor at least one type of common search space and/or one UE-specificsearch space. For example, a base station may not configure a UE withouta common search space on a PCell, or on a PSCell, in an active DL BWP.

For an UL BWP in a set of one or more UL BWPs, a base station mayconfigure a UE with one or more resource sets for one or more PUCCHtransmissions.

In an example, if a DCI comprises a BWP indicator field, a BWP indicatorfield value may indicate an active DL BWP, from a configured DL BWP set,for one or more DL receptions. If a DCI comprises a BWP indicator field,a BWP indicator field value may indicate an active UL BWP, from aconfigured UL BWP set, for one or more UL transmissions.

In an example, for a PCell, a base station may semi-statisticallyconfigure a UE with a default DL BWP among configured DL BWPs. If a UEis not provided a default DL BWP, a default BWP may be an initial activeDL BWP.

In an example, a base station may configure a UE with a timer value fora PCell. For example, a UE may start a timer, referred to as BWPinactivity timer, when a UE detects a DCI indicating an active DL BWP,other than a default DL BWP, for a paired spectrum operation or when aUE detects a DCI indicating an active DL BWP or UL BWP, other than adefault DL BWP or UL BWP, for an unpaired spectrum operation. The UE mayincrement the timer by an interval of a first value (e.g., the firstvalue may be 1 millisecond or 0.5 milliseconds) if the UE does notdetect a DCI during the interval for a paired spectrum operation or foran unpaired spectrum operation. In an example, the timer may expire whenthe timer is equal to the timer value. A UE may switch to the default DLBWP from an active DL BWP when the timer expires.

In an example, a base station may semi-statistically configure a UE withone or more BWPs. A UE may switch an active BWP from a first BWP to asecond BWP in response to receiving a DCI indicating the second BWP asan active BWP and/or in response to an expiry of BWP inactivity timer(for example, the second BWP may be a default BWP). For example, FIG. 10is an example diagram of 3 BWPs configured, BWP1 (1010 and 1050), BWP2(1020 and 1040), and BWP3 (1030). BWP2 (1020 and 1040) may be a defaultBWP. BWP1 (1010) may be an initial active BWP. In an example, a UE mayswitch an active BWP from BWP1 1010 to BWP2 1020 in response to anexpiry of BWP inactivity timer. For example, a UE may switch an activeBWP from BWP2 1020 to BWP3 1030 in response to receiving a DCIindicating BWP3 1030 as an active BWP. Switching an active BWP from BWP31030 to BWP2 1040 and/or from BWP2 1040 to BWP1 1050 may be in responseto receiving a DCI indicating an active BWP and/or in response to anexpiry of BWP inactivity timer.

In an example, if a UE is configured for a secondary cell with a defaultDL BWP among configured DL BWPs and a timer value, UE procedures on asecondary cell may be same as on a primary cell using the timer valuefor the secondary cell and the default DL BWP for the secondary cell.

In an example, if a base station configures a UE with a first active DLBWP and a first active UL BWP on a secondary cell or carrier, a UE mayemploy an indicated DL BWP and an indicated UL BWP on a secondary cellas a respective first active DL BWP and first active UL BWP on asecondary cell or carrier.

FIG. 11A and FIG. 11B show packet flows employing a multi connectivity(e.g. dual connectivity, multi connectivity, tight interworking, and/orthe like). FIG. 11A is an example diagram of a protocol structure of awireless device 110 (e.g. UE) with CA and/or multi connectivity as peran aspect of an embodiment. FIG. 11B is an example diagram of a protocolstructure of multiple base stations with CA and/or multi connectivity asper an aspect of an embodiment. The multiple base stations may comprisea master node, MN 1130 (e.g. a master node, a master base station, amaster gNB, a master eNB, and/or the like) and a secondary node, SN 1150(e.g. a secondary node, a secondary base station, a secondary gNB, asecondary eNB, and/or the like). A master node 1130 and a secondary node1150 may co-work to communicate with a wireless device 110.

When multi connectivity is configured for a wireless device 110, thewireless device 110, which may support multiple reception/transmissionfunctions in an RRC connected state, may be configured to utilize radioresources provided by multiple schedulers of a multiple base stations.Multiple base stations may be inter-connected via a non-ideal or idealbackhaul (e.g. Xn interface, X2 interface, and/or the like). A basestation involved in multi connectivity for a certain wireless device mayperform at least one of two different roles: a base station may eitheract as a master base station or as a secondary base station. In multiconnectivity, a wireless device may be connected to one master basestation and one or more secondary base stations. In an example, a masterbase station (e.g. the MN 1130) may provide a master cell group (MCG)comprising a primary cell and/or one or more secondary cells for awireless device (e.g. the wireless device 110). A secondary base station(e.g. the SN 1150) may provide a secondary cell group (SCG) comprising aprimary secondary cell (PSCell) and/or one or more secondary cells for awireless device (e.g. the wireless device 110).

In multi connectivity, a radio protocol architecture that a beareremploys may depend on how a bearer is setup. In an example, threedifferent type of bearer setup options may be supported: an MCG bearer,an SCG bearer, and/or a split bearer. A wireless device mayreceive/transmit packets of an MCG bearer via one or more cells of theMCG, and/or may receive/transmits packets of an SCG bearer via one ormore cells of an SCG. Multi-connectivity may also be described as havingat least one bearer configured to use radio resources provided by thesecondary base station. Multi-connectivity may or may not beconfigured/implemented in some of the example embodiments.

In an example, a wireless device (e.g. Wireless Device 110) may transmitand/or receive: packets of an MCG bearer via an SDAP layer (e.g. SDAP1110), a PDCP layer (e.g. NR PDCP 1111), an RLC layer (e.g. MN RLC1114), and a MAC layer (e.g. MN MAC 1118); packets of a split bearer viaan SDAP layer (e.g. SDAP 1110), a PDCP layer (e.g. NR PDCP 1112), one ofa master or secondary RLC layer (e.g. MN RLC 1115, SN RLC 1116), and oneof a master or secondary MAC layer (e.g. MN MAC 1118, SN MAC 1119);and/or packets of an SCG bearer via an SDAP layer (e.g. SDAP 1110), aPDCP layer (e.g. NR PDCP 1113), an RLC layer (e.g. SN RLC 1117), and aMAC layer (e.g. MN MAC 1119).

In an example, a master base station (e.g. MN 1130) and/or a secondarybase station (e.g. SN 1150) may transmit/receive: packets of an MCGbearer via a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP1140), a master or secondary node PDCP layer (e.g. NR PDCP 1121, NR PDCP1142), a master node RLC layer (e.g. MN RLC 1124, MN RLC 1125), and amaster node MAC layer (e.g. MN MAC 1128); packets of an SCG bearer via amaster or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), amaster or secondary node PDCP layer (e.g. NR PDCP 1122, NR PDCP 1143), asecondary node RLC layer (e.g. SN RLC 1146, SN RLC 1147), and asecondary node MAC layer (e.g. SN MAC 1148); packets of a split bearervia a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), amaster or secondary node PDCP layer (e.g. NR PDCP 1123, NR PDCP 1141), amaster or secondary node RLC layer (e.g. MN RLC 1126, SN RLC 1144, SNRLC 1145, MN RLC 1127), and a master or secondary node MAC layer (e.g.MN MAC 1128, SN MAC 1148).

In multi connectivity, a wireless device may configure multiple MACentities: one MAC entity (e.g. MN MAC 1118) for a master base station,and other MAC entities (e.g. SN MAC 1119) for a secondary base station.In multi-connectivity, a configured set of serving cells for a wirelessdevice may comprise two subsets: an MCG comprising serving cells of amaster base station, and SCGs comprising serving cells of a secondarybase station. For an SCG, one or more of following configurations may beapplied: at least one cell of an SCG has a configured UL CC and at leastone cell of a SCG, named as primary secondary cell (PSCell, PCell ofSCG, or sometimes called PCell), is configured with PUCCH resources;when an SCG is configured, there may be at least one SCG bearer or oneSplit bearer; upon detection of a physical layer problem or a randomaccess problem on a PSCell, or a number of NR RLC retransmissions hasbeen reached associated with the SCG, or upon detection of an accessproblem on a PSCell during a SCG addition or a SCG change: an RRCconnection re-establishment procedure may not be triggered, ULtransmissions towards cells of an SCG may be stopped, a master basestation may be informed by a wireless device of a SCG failure type, forsplit bearer, a DL data transfer over a master base station may bemaintained; an NR RLC acknowledged mode (AM) bearer may be configuredfor a split bearer; PCell and/or PSCell may not be de-activated; PSCellmay be changed with a SCG change procedure (e.g. with security keychange and a RACH procedure); and/or a bearer type change between asplit bearer and a SCG bearer or simultaneous configuration of a SCG anda split bearer may or may not supported.

With respect to interaction between a master base station and asecondary base stations for multi-connectivity, one or more of thefollowing may be applied: a master base station and/or a secondary basestation may maintain RRM measurement configurations of a wirelessdevice; a master base station may (e.g. based on received measurementreports, traffic conditions, and/or bearer types) may decide to requesta secondary base station to provide additional resources (e.g. servingcells) for a wireless device; upon receiving a request from a masterbase station, a secondary base station may create/modify a containerthat may result in configuration of additional serving cells for awireless device (or decide that the secondary base station has noresource available to do so); for a UE capability coordination, a masterbase station may provide (a part of) an AS configuration and UEcapabilities to a secondary base station; a master base station and asecondary base station may exchange information about a UE configurationby employing of RRC containers (inter-node messages) carried via Xnmessages; a secondary base station may initiate a reconfiguration of thesecondary base station existing serving cells (e.g. PUCCH towards thesecondary base station); a secondary base station may decide which cellis a PSCell within a SCG; a master base station may or may not changecontent of RRC configurations provided by a secondary base station; incase of a SCG addition and/or a SCG SCell addition, a master basestation may provide recent (or the latest) measurement results for SCGcell(s); a master base station and secondary base stations may receiveinformation of SFN and/or subframe offset of each other from OAM and/orvia an Xn interface, (e.g. for a purpose of DRX alignment and/oridentification of a measurement gap). In an example, when adding a newSCG SCell, dedicated RRC signaling may be used for sending requiredsystem information of a cell as for CA, except for a SFN acquired from aMIB of a PSCell of a SCG.

FIG. 12 is an example diagram of a random access procedure. One or moreevents may trigger a random access procedure. For example, one or moreevents may be at least one of following: initial access from RRC_IDLE,RRC connection re-establishment procedure, handover, DL or UL dataarrival during RRC CONNECTED when UL synchronization status isnon-synchronized, transition from RRC_Inactive, and/or request for othersystem information. For example, a PDCCH order, a MAC entity, and/or abeam failure indication may initiate a random access procedure.

In an example embodiment, a random access procedure may be at least oneof a contention based random access procedure and a contention freerandom access procedure. For example, a contention based random accessprocedure may comprise, one or more Msg 1 1220 transmissions, one ormore Msg2 1230 transmissions, one or more Msg3 1240 transmissions, andcontention resolution 1250. For example, a contention free random accessprocedure may comprise one or more Msg 1 1220 transmissions and one ormore Msg2 1230 transmissions.

In an example, a base station may transmit (e.g., unicast, multicast, orbroadcast), to a UE, a RACH configuration 1210 via one or more beams.The RACH configuration 1210 may comprise one or more parametersindicating at least one of following: available set of PRACH resourcesfor a transmission of a random access preamble, initial preamble power(e.g., random access preamble initial received target power), an RSRPthreshold for a selection of a SS block and corresponding PRACHresource, a power-ramping factor (e.g., random access preamble powerramping step), random access preamble index, a maximum number ofpreamble transmission, preamble group A and group B, a threshold (e.g.,message size) to determine the groups of random access preambles, a setof one or more random access preambles for system information requestand corresponding PRACH resource(s), if any, a set of one or more randomaccess preambles for beam failure recovery request and correspondingPRACH resource(s), if any, a time window to monitor RA response(s), atime window to monitor response(s) on beam failure recovery request,and/or a contention resolution timer.

In an example, the Msg1 1220 may be one or more transmissions of arandom access preamble. For a contention based random access procedure,a UE may select a SS block with a RSRP above the RSRP threshold. Ifrandom access preambles group B exists, a UE may select one or morerandom access preambles from a group A or a group B depending on apotential Msg3 1240 size. If a random access preambles group B does notexist, a UE may select the one or more random access preambles from agroup A. A UE may select a random access preamble index randomly (e.g.with equal probability or a normal distribution) from one or more randomaccess preambles associated with a selected group. If a base stationsemi-statistically configures a UE with an association between randomaccess preambles and SS blocks, the UE may select a random accesspreamble index randomly with equal probability from one or more randomaccess preambles associated with a selected SS block and a selectedgroup.

For example, a UE may initiate a contention free random access procedurebased on a beam failure indication from a lower layer. For example, abase station may semi-statistically configure a UE with one or morecontention free PRACH resources for beam failure recovery requestassociated with at least one of SS blocks and/or CSI-RS. If at least oneof SS blocks with a RSRP above a first RSRP threshold amongst associatedSS blocks or at least one of CSI-RSs with a RSRP above a second RSRPthreshold amongst associated CSI-RSs is available, a UE may select arandom access preamble index corresponding to a selected SS block orCSI-RS from a set of one or more random access preambles for beamfailure recovery request.

For example, a UE may receive, from a base station, a random accesspreamble index via PDCCH or RRC for a contention free random accessprocedure. If a base station does not configure a UE with at least onecontention free PRACH resource associated with SS blocks or CSI-RS, theUE may select a random access preamble index. If a base stationconfigures a UE with one or more contention free PRACH resourcesassociated with SS blocks and at least one SS block with a RSRP above afirst RSRP threshold amongst associated SS blocks is available, the UEmay select the at least one SS block and select a random access preamblecorresponding to the at least one SS block. If a base station configuresa UE with one or more contention free PRACH resources associated withCSI-RSs and at least one CSI-RS with a RSRP above a second RSPRthreshold amongst the associated CSI-RSs is available, the UE may selectthe at least one CSI-RS and select a random access preamblecorresponding to the at least one CSI-RS.

A UE may perform one or more Msg1 1220 transmissions by transmitting theselected random access preamble. For example, if a UE selects an SSblock and is configured with an association between one or more PRACHoccasions and one or more SS blocks, the UE may determine an PRACHoccasion from one or more PRACH occasions corresponding to a selected SSblock. For example, if a UE selects a CSI-RS and is configured with anassociation between one or more PRACH occasions and one or more CSI-RSs,the UE may determine a PRACH occasion from one or more PRACH occasionscorresponding to a selected CSI-RS. A UE may transmit, to a basestation, a selected random access preamble via a selected PRACHoccasions. A UE may determine a transmit power for a transmission of aselected random access preamble at least based on an initial preamblepower and a power-ramping factor. A UE may determine a RA-RNTIassociated with a selected PRACH occasions in which a selected randomaccess preamble is transmitted. For example, a UE may not determine aRA-RNTI for a beam failure recovery request. A UE may determine anRA-RNTI at least based on an index of a first OFDM symbol and an indexof a first slot of a selected PRACH occasions, and/or an uplink carrierindex for a transmission of Msg1 1220.

In an example, a UE may receive, from a base station, a random accessresponse, Msg 2 1230. A UE may start a time window (e.g.,ra-ResponseWindow) to monitor a random access response. For beam failurerecovery request, a base station may configure a UE with a differenttime window (e.g., bfr-ResponseWindow) to monitor response on beamfailure recovery request. For example, a UE may start a time window(e.g., ra-ResponseWindow or bfr-ResponseWindow) at a start of a firstPDCCH occasion after a fixed duration of one or more symbols from an endof a preamble transmission. If a UE transmits multiple preambles, the UEmay start a time window at a start of a first PDCCH occasion after afixed duration of one or more symbols from an end of a first preambletransmission. A UE may monitor a PDCCH of a cell for at least one randomaccess response identified by a RA-RNTI or for at least one response tobeam failure recovery request identified by a C-RNTI while a timer for atime window is running.

In an example, a UE may consider a reception of random access responsesuccessful if at least one random access response comprises a randomaccess preamble identifier corresponding to a random access preambletransmitted by the UE. A UE may consider the contention free randomaccess procedure successfully completed if a reception of random accessresponse is successful. If a contention free random access procedure istriggered for a beam failure recovery request, a UE may consider acontention free random access procedure successfully complete if a PDCCHtransmission is addressed to a C-RNTI. In an example, if at least onerandom access response comprises a random access preamble identifier, aUE may consider the random access procedure successfully completed andmay indicate a reception of an acknowledgement for a system informationrequest to upper layers. If a UE has signaled multiple preambletransmissions, the UE may stop transmitting remaining preambles (if any)in response to a successful reception of a corresponding random accessresponse.

In an example, a UE may perform one or more Msg 3 1240 transmissions inresponse to a successful reception of random access response (e.g., fora contention based random access procedure). A UE may adjust an uplinktransmission timing based on a timing advanced command indicated by arandom access response and may transmit one or more transport blocksbased on an uplink grant indicated by a random access response.Subcarrier spacing for PUSCH transmission for Msg3 1240 may be providedby at least one higher layer (e.g. RRC) parameter. A UE may transmit arandom access preamble via PRACH and Msg3 1240 via PUSCH on a same cell.A base station may indicate an UL BWP for a PUSCH transmission of Msg31240 via system information block. A UE may employ HARQ for aretransmission of Msg 3 1240.

In an example, multiple UEs may perform Msg 1 1220 by transmitting asame preamble to a base station and receive, from the base station, asame random access response comprising an identity (e.g., TC-RNTI).Contention resolution 1250 may ensure that a UE does not incorrectly usean identity of another UE. For example, contention resolution 1250 maybe based on C-RNTI on PDCCH or a UE contention resolution identity onDL-SCH. For example, if a base station assigns a C-RNTI to a UE, the UEmay perform contention resolution 1250 based on a reception of a PDCCHtransmission that is addressed to the C-RNTI. In response to detectionof a C-RNTI on a PDCCH, a UE may consider contention resolution 1250successful and may consider a random access procedure successfullycompleted. If a UE has no valid C-RNTI, a contention resolution may beaddressed by employing a TC-RNTI. For example, if a MAC PDU issuccessfully decoded and a MAC PDU comprises a UE contention resolutionidentity MAC CE that matches the CCCH SDU transmitted in Msg3 1250, a UEmay consider the contention resolution 1250 successful and may considerthe random access procedure successfully completed.

FIG. 13 is an example structure for MAC entities as per an aspect of anembodiment. In an example, a wireless device may be configured tooperate in a multi-connectivity mode. A wireless device in RRC_CONNECTEDwith multiple RX/TX may be configured to utilize radio resourcesprovided by multiple schedulers located in a plurality of base stations.The plurality of base stations may be connected via a non-ideal or idealbackhaul over the Xn interface. In an example, a base station in aplurality of base stations may act as a master base station or as asecondary base station. A wireless device may be connected to one masterbase station and one or more secondary base stations. A wireless devicemay be configured with multiple MAC entities, e.g. one MAC entity formaster base station, and one or more other MAC entities for secondarybase station(s). In an example, a configured set of serving cells for awireless device may comprise two subsets: an MCG comprising servingcells of a master base station, and one or more SCGs comprising servingcells of a secondary base station(s). FIG. 13 illustrates an examplestructure for MAC entities when MCG and SCG are configured for awireless device.

In an example, at least one cell in a SCG may have a configured UL CC,wherein a cell of at least one cell may be called PSCell or PCell ofSCG, or sometimes may be simply called PCell. A PSCell may be configuredwith PUCCH resources. In an example, when a SCG is configured, there maybe at least one SCG bearer or one split bearer. In an example, upondetection of a physical layer problem or a random access problem on aPSCell, or upon reaching a number of RLC retransmissions associated withthe SCG, or upon detection of an access problem on a PSCell during a SCGaddition or a SCG change: an RRC connection re-establishment proceduremay not be triggered, UL transmissions towards cells of an SCG may bestopped, a master base station may be informed by a UE of a SCG failuretype and DL data transfer over a master base station may be maintained.

In an example, a MAC sublayer may provide services such as data transferand radio resource allocation to upper layers (e.g. 1310 or 1320). A MACsublayer may comprise a plurality of MAC entities (e.g. 1350 and 1360).A MAC sublayer may provide data transfer services on logical channels.To accommodate different kinds of data transfer services, multiple typesof logical channels may be defined. A logical channel may supporttransfer of a particular type of information. A logical channel type maybe defined by what type of information (e.g., control or data) istransferred. For example, BCCH, PCCH, CCCH and DCCH may be controlchannels and DTCH may be a traffic channel. In an example, a first MACentity (e.g. 1310) may provide services on PCCH, BCCH, CCCH, DCCH, DTCHand MAC control elements. In an example, a second MAC entity (e.g. 1320)may provide services on BCCH, DCCH, DTCH and MAC control elements.

A MAC sublayer may expect from a physical layer (e.g. 1330 or 1340)services such as data transfer services, signaling of HARQ feedback,signaling of scheduling request or measurements (e.g. CQI). In anexample, in dual connectivity, two MAC entities may be configured for awireless device: one for MCG and one for SCG. A MAC entity of wirelessdevice may handle a plurality of transport channels. In an example, afirst MAC entity may handle first transport channels comprising a PCCHof MCG, a first BCH of MCG, one or more first DL-SCHs of MCG, one ormore first UL-SCHs of MCG and one or more first RACHs of MCG. In anexample, a second MAC entity may handle second transport channelscomprising a second BCH of SCG, one or more second DL-SCHs of SCG, oneor more second UL-SCHs of SCG and one or more second RACHs of SCG.

In an example, if a MAC entity is configured with one or more SCells,there may be multiple DL-SCHs and there may be multiple UL-SCHs as wellas multiple RACHs per MAC entity. In an example, there may be one DL-SCHand UL-SCH on a SpCell. In an example, there may be one DL-SCH, zero orone UL-SCH and zero or one RACH for an SCell. A DL-SCH may supportreceptions using different numerologies and/or TTI duration within a MACentity. A UL-SCH may also support transmissions using differentnumerologies and/or TTI duration within the MAC entity.

In an example, a MAC sublayer may support different functions and maycontrol these functions with a control (e.g. 1355 or 1365) element.Functions performed by a MAC entity may comprise mapping between logicalchannels and transport channels (e.g., in uplink or downlink),multiplexing (e.g. 1352 or 1362) of MAC SDUs from one or differentlogical channels onto transport blocks (TB) to be delivered to thephysical layer on transport channels (e.g., in uplink), demultiplexing(e.g. 1352 or 1362) of MAC SDUs to one or different logical channelsfrom transport blocks (TB) delivered from the physical layer ontransport channels (e.g., in downlink), scheduling information reporting(e.g., in uplink), error correction through HARQ in uplink or downlink(e.g. 1363), and logical channel prioritization in uplink (e.g. 1351 or1361). A MAC entity may handle a random access process (e.g. 1354 or1364).

FIG. 14 is an example diagram of a RAN architecture comprising one ormore base stations. In an example, a protocol stack (e.g. RRC, SDAP,PDCP, RLC, MAC, and PHY) may be supported at a node. A base station(e.g. gNB 120A or 120B) may comprise a base station central unit (CU)(e.g. gNB-CU 1420A or 1420B) and at least one base station distributedunit (DU) (e.g. gNB-DU 1430A, 1430B, 1430C, or 1430D) if a functionalsplit is configured. Upper protocol layers of a base station may belocated in a base station CU, and lower layers of the base station maybe located in the base station DUs. An F1 interface (e.g. CU-DUinterface) connecting a base station CU and base station DUs may be anideal or non-ideal backhaul. F1-C may provide a control plane connectionover an F1 interface, and F1-U may provide a user plane connection overthe F1 interface. In an example, an Xn interface may be configuredbetween base station CUs.

In an example, a base station CU may comprise an RRC function, an SDAPlayer, and a PDCP layer, and base station DUs may comprise an RLC layer,a MAC layer, and a PHY layer. In an example, various functional splitoptions between a base station CU and base station DUs may be possibleby locating different combinations of upper protocol layers (RANfunctions) in a base station CU and different combinations of lowerprotocol layers (RAN functions) in base station DUs. A functional splitmay support flexibility to move protocol layers between a base stationCU and base station DUs depending on service requirements and/or networkenvironments.

In an example, functional split options may be configured per basestation, per base station CU, per base station DU, per UE, per bearer,per slice, or with other granularities. In per base station CU split, abase station CU may have a fixed split option, and base station DUs maybe configured to match a split option of a base station CU. In per basestation DU split, a base station DU may be configured with a differentsplit option, and a base station CU may provide different split optionsfor different base station DUs. In per UE split, a base station (basestation CU and at least one base station DUs) may provide differentsplit options for different wireless devices. In per bearer split,different split options may be utilized for different bearers. In perslice splice, different split options may be applied for differentslices.

FIG. 15 is an example diagram showing RRC state transitions of awireless device. In an example, a wireless device may be in at least oneRRC state among an RRC connected state (e.g. RRC Connected 1530,RRC_Connected), an RRC idle state (e.g. RRC Idle 1510, RRC_Idle), and/oran RRC inactive state (e.g. RRC Inactive 1520, RRC_Inactive). In anexample, in an RRC connected state, a wireless device may have at leastone RRC connection with at least one base station (e.g. gNB and/or eNB),which may have a UE context of the wireless device. A UE context (e.g. awireless device context) may comprise at least one of an access stratumcontext, one or more radio link configuration parameters, bearer (e.g.data radio bearer (DRB), signaling radio bearer (SRB), logical channel,QoS flow, PDU session, and/or the like) configuration information,security information, PHY/MAC/RLC/PDCP/SDAP layer configurationinformation, and/or the like configuration information for a wirelessdevice. In an example, in an RRC idle state, a wireless device may nothave an RRC connection with a base station, and a UE context of awireless device may not be stored in a base station. In an example, inan RRC inactive state, a wireless device may not have an RRC connectionwith a base station. A UE context of a wireless device may be stored ina base station, which may be called as an anchor base station (e.g. lastserving base station).

In an example, a wireless device may transition a UE RRC state betweenan RRC idle state and an RRC connected state in both ways (e.g.connection release 1540 or connection establishment 1550; or connectionreestablishment) and/or between an RRC inactive state and an RRCconnected state in both ways (e.g. connection inactivation 1570 orconnection resume 1580). In an example, a wireless device may transitionits RRC state from an RRC inactive state to an RRC idle state (e.g.connection release 1560).

In an example, an anchor base station may be a base station that maykeep a UE context (a wireless device context) of a wireless device atleast during a time period that a wireless device stays in a RANnotification area (RNA) of an anchor base station, and/or that awireless device stays in an RRC inactive state. In an example, an anchorbase station may be a base station that a wireless device in an RRCinactive state was lastly connected to in a latest RRC connected stateor that a wireless device lastly performed an RNA update procedure in.In an example, an RNA may comprise one or more cells operated by one ormore base stations. In an example, a base station may belong to one ormore RNAs. In an example, a cell may belong to one or more RNAs.

In an example, a wireless device may transition a UE RRC state from anRRC connected state to an RRC inactive state in a base station. Awireless device may receive RNA information from the base station. RNAinformation may comprise at least one of an RNA identifier, one or morecell identifiers of one or more cells of an RNA, a base stationidentifier, an IP address of the base station, an AS context identifierof the wireless device, a resume identifier, and/or the like.

In an example, an anchor base station may broadcast a message (e.g. RANpaging message) to base stations of an RNA to reach to a wireless devicein an RRC inactive state, and/or the base stations receiving the messagefrom the anchor base station may broadcast and/or multicast anothermessage (e.g. paging message) to wireless devices in their coveragearea, cell coverage area, and/or beam coverage area associated with theRNA through an air interface.

In an example, when a wireless device in an RRC inactive state movesinto a new RNA, the wireless device may perform an RNA update (RNAU)procedure, which may comprise a random access procedure by the wirelessdevice and/or a UE context retrieve procedure. A UE context retrieve maycomprise: receiving, by a base station from a wireless device, a randomaccess preamble; and fetching, by a base station, a UE context of thewireless device from an old anchor base station. Fetching may comprise:sending a retrieve UE context request message comprising a resumeidentifier to the old anchor base station and receiving a retrieve UEcontext response message comprising the UE context of the wirelessdevice from the old anchor base station.

In an example embodiment, a wireless device in an RRC inactive state mayselect a cell to camp on based on at least a on measurement results forone or more cells, a cell where a wireless device may monitor an RNApaging message and/or a core network paging message from a base station.In an example, a wireless device in an RRC inactive state may select acell to perform a random access procedure to resume an RRC connectionand/or to transmit one or more packets to a base station (e.g. to anetwork). In an example, if a cell selected belongs to a different RNAfrom an RNA for a wireless device in an RRC inactive state, the wirelessdevice may initiate a random access procedure to perform an RNA updateprocedure. In an example, if a wireless device in an RRC inactive statehas one or more packets, in a buffer, to transmit to a network, thewireless device may initiate a random access procedure to transmit oneor more packets to a base station of a cell that the wireless deviceselects. A random access procedure may be performed with two messages(e.g. 2 stage random access) and/or four messages (e.g. 4 stage randomaccess) between the wireless device and the base station.

In an example embodiment, a base station receiving one or more uplinkpackets from a wireless device in an RRC inactive state may fetch a UEcontext of a wireless device by transmitting a retrieve UE contextrequest message for the wireless device to an anchor base station of thewireless device based on at least one of an AS context identifier, anRNA identifier, a base station identifier, a resume identifier, and/or acell identifier received from the wireless device. In response tofetching a UE context, a base station may transmit a path switch requestfor a wireless device to a core network entity (e.g. AMF, MME, and/orthe like). A core network entity may update a downlink tunnel endpointidentifier for one or more bearers established for the wireless devicebetween a user plane core network entity (e.g. UPF, S-GW, and/or thelike) and a RAN node (e.g. the base station), e.g. changing a downlinktunnel endpoint identifier from an address of the anchor base station toan address of the base station.

A gNB may communicate with a wireless device via a wireless networkemploying one or more new radio technologies. The one or more radiotechnologies may comprise at least one of: multiple technologies relatedto physical layer; multiple technologies related to medium accesscontrol layer; and/or multiple technologies related to radio resourcecontrol layer. Example embodiments of enhancing the one or more radiotechnologies may improve performance of a wireless network. Exampleembodiments may increase the system throughput, or data rate oftransmission. Example embodiments may reduce battery consumption of awireless device. Example embodiments may improve latency of datatransmission between a gNB and a wireless device. Example embodimentsmay improve network coverage of a wireless network. Example embodimentsmay improve transmission efficiency of a wireless network.

In an example, a base station may use an information element (IE)CSI-AperiodicTriggerStateList to configure a wireless device with one ormore aperiodic trigger states (e.g., 1, 64, 128 aperiodic triggerstates). A codepoint of a CSI request field in a DCI may be associatedwith (or indicate) an aperiodic trigger state of the one or moreaperiodic trigger states. In an example, the aperiodic trigger state maycomprise one or more report configurations (e.g., 1, 8, 16 reportconfigurations, provided by a higher layer parameterassociatedReportConfigInfoList). Based on receiving the DCI with the CSIrequest field indicating the aperiodic trigger state, the wirelessdevice may perform measurement of CSI-RS and aperiodic reportingaccording to the one or more report configurations (e.g., in the associatedReportConfigInfoList) for the aperiodic trigger state.

In an example, a report configuration (e.g., provided by a higher layerparameter CSI-AssociatedReportConfiglnfo) of the one or more reportconfigurations may be identified/associated with a report configurationindex (e.g., provided by a higher layer parameter CSI-ReportConfigId).In an example, the report configuration may comprise one or more CSIresources (e.g., 1, 8, 16 CSI resources). In an example, an aperiodicCSI resource of the one or more CSI resources may be associated with aTCI state (provided by a higher layer parameter qcl-info in IECSI-AperiodicTriggerStateList) of one or more TCI-State configurations.The TCI state may provide a QCL assumption (e.g., an RS, an RS source,SS/PBCH block, CSI-RS). The TCI state may provide a QCL type (e.g.,QCL-TypeA, QCL-TypeD, etc.).

In an example, the wireless device may receive a DCI with a CSI requestfield from a base station. The wireless device may receive the DCI in aPDCCH. The wireless device may receive the DCI when monitoring thePDCCH. In an example, the DCI with the CSI request field mayinitiate/indicate/trigger an aperiodic trigger state of the one or moreaperiodic trigger states. In an example, a codepoint of the CSI requestfield in the DCI may indicate the aperiodic trigger state. In anexample, the aperiodic trigger state may comprise one or more reportconfigurations (e.g., a list of NZP-CSI-RS-ResourceSet). In an example,a report configuration (e.g., NZP-CSI-RS-ResourceSet) of the one or morereport configurations may comprise one or more CSI resources (e.g.,aperiodic CSI-RS resources, NZP-CSI-RS-Resources).

In an example, the base station may not configure the reportconfiguration with a higher layer parameter trs-Info. In an example,configuring the report configuration without the higher layer parametertrs-Info may comprise that a first antenna port for a first aperiodicCSI resource of the one or more CSI resources is different from a secondantenna port for a second aperiodic CSI resource of the one or more CSIresources. In an example, configuring the report configuration withoutthe higher layer parameter trs-Info may comprise that an antenna portfor each aperiodic CSI-RS resource of the one or more CSI resources isdifferent. In an example, the base station may not configure the reportconfiguration with a higher layer parameter repetition. In an example, ascheduling offset between a last symbol of the PDCCH carrying the DCIand a first symbol of the one or more CSI resources in the reportconfiguration may be smaller than a second threshold (e.g.,beamSwitchTiming). In an example, the wireless device may report thesecond threshold. In an example, the second threshold may be a firstvalue (e.g., 14, 28, 48 symbols).

In an example, an aperiodic CSI resource of the one or more CSIresources may be associated with a first TCI state of the one or moreTCI-State configurations. In an example, the first TCI state mayindicate at least one first RS. In an example, the first TCI state mayindicate at least one first QCL type. In an example, the aperiodic CSIresource being associated with the first TCI state may comprise that thewireless device receives an aperiodic CSI-RS of the aperiodic CSIresource with the at least one first RS (indicated by the first TCIstate) with respect to the at least one first QCL type indicated by thefirst TCI state.

In an example, the base station may transmit a downlink signal with asecond TCI state. In an example, the second TCI state may indicate atleast one second RS. In an example, the second TCI state may indicate atleast one second QCL type. The wireless device may receive the downlinksignal in one or more first symbols. The wireless device may receive anaperiodic CSI-RS for the aperiodic CSI resource in one or more secondsymbols. In an example, the one or more first symbols and the one ormore second symbols may overlap (e.g., fully or partially). In anexample, the downlink signal and the aperiodic CSI-RS (or the aperiodicCSI-RS resource) may overlap based on the one or more first symbols andthe one or more second symbols overlapping.

In an example, the downlink signal and the aperiodic CSI-RS (or theaperiodic CSI-RS resource) may overlap in a time duration. In anexample, the time duration may be at least one symbol. In an example,the time duration may be at least one slot. In an example, the timeduration may be at least one subframe. In an example, the time durationmay be at least one mini-slot. In an example, the time duration may bethe one or more second symbols. In an example, the time duration may bethe one or more first symbols.

In an example, the downlink signal may be a PDSCH scheduled with anoffset larger than or equal to a first threshold (e.g.,Threshold-Sched-Offset, timeDurationForQCL). In an example, the downlinksignal may be a second aperiodic CSI-RS scheduled with an offset largerthan or equal a second threshold (e.g., beamSwitchTiming) when thesecond threshold is a first value (e.g., 14, 28, 48 symbols). In anexample, the downlink signal may be an RS (e.g., periodic CSI-RS,semi-persistent CSI-RS, SS/PBCH block etc.).

In an example, when the scheduling offset between the last symbol of thePDCCH and the first symbol is smaller than the second threshold, basedon the downlink signal with the second TCI state and the aperiodicCSI-RS (or the aperiodic CSI-RS resource) overlapping, the wirelessdevice may apply a QCL assumption provided/indicated by the second TCIstate when receiving the aperiodic CSI-RS. In an example, the applyingthe QCL assumption (provided/indicated by the second TCI state) whenreceiving the aperiodic CSI may comprise that the wireless devicereceives the aperiodic CSI-RS with the at least one second RS (indicatedby the second TCI state) with respect to the at least one second QCLtype indicated by the second TCI state.

In an example, a scheduling offset between a last symbol of the PDCCHcarrying the DCI and a first symbol of the one or more CSI resources inthe report configuration may be equal to or larger than a secondthreshold (e.g., beamSwitchTiming). In an example, the wireless devicemay report the second threshold. In an example, the second threshold maybe a first value (e.g., 14, 28, 48 symbols). Based on the schedulingoffset being equal to or larger than the second threshold, the wirelessdevice may apply a QCL assumption (provided by the first TCI state) forthe aperiodic CSI resource of the one or more CSI resources in thereport configuration. In an example, the applying the QCL assumption(provided by the first TCI state) for the aperiodic CSI resource maycomprise that the wireless device receives the aperiodic CSI-RS of theaperiodic CSI resource with the at least one first RS (indicated by thefirst TCI state) with respect to the at least one first QCL typeindicated by the first TCI state.

In an example, a wireless device may receive higher layer parameterTCI-States for PDCCH receptions. In an example, the higher layerparameter TCI-States may contain a single TCI state. In response to thehigher layer parameter TCI-States may containing the single TCI state,the wireless device may assume that the DM-RS antenna port associatedwith the PDCCH receptions is quasi co-located with the one or more DL RSconfigured by the single TCI state.

In an example, a base station may indicate, to a wireless device, a TCIstate for PDCCH reception for a coreset of a serving cell by sending aTCI state indication for UE-specific PDCCH MAC CE. In an example, if aMAC entity of the wireless device receives a TCI state indication forUE-specific PDCCH MAC CE on/for a serving cell, the MAC entity mayindicate to lower layers (e.g., PHY) the information regarding the TCIstate indication for the UE-specific PDCCH MAC CE.

In an example, a TCI state indication for UE-specific PDCCH MAC CE maybe identified by a MAC PDU subheader with LCID. The TCI state indicationfor UE-specific PDCCH MAC CE may have a fixed size of 16 bits comprisingone or more fields. In an example, the one or more fields may comprise aserving cell ID, coreset ID, TCI state ID and a reserved bit.

In an example, the serving cell ID may indicate the identity of theserving cell for which the TCI state indication for the UE-specificPDCCH MAC CE applies. The length of the serving cell ID may be n bits(e.g., n=5 bits).

In an example, the coreset ID may indicate a control resource set. Thecontrol resource set may be identified with a control resource set ID(e.g., ControlResourceSetId). The TCI State is being indicated to thecontrol resource set ID for which. The length of the coreset ID may ben3 bits (e.g., n3=4 bits).

In an example, the TCI state ID may indicate the TCI state identified byTCI-StateId. The TCI state may be applicable to the control resource setidentified by the coreset ID. The length of the TCI state ID may be n4bits (e.g., n4=6 bits).

In an LTE/LTE-A or 5G system, when configured with DRX operation, a UEmay monitor PDCCH for detecting one or more DCIs during the DRX Activetime of a DRX cycle. The UE may stop monitoring PDCCH during the DRXsleep/Off time of the DRX cycle, to save power consumption. In somecases, the UE may fail to detect the one or more DCIs during the DRXActive time, since the one or more DCIs are not addressed to the UE. Forexample, a UE may be an URLLC UE, or a NB-IoT UE, or an MTC UE. The UEmay not always have data to be received from a gNB, in which case,waking up to monitor PDCCH in the DRX active time may result in uselesspower consumption. A wake-up mechanism combined with DRX operation maybe used to further reduce power consumption specifically in a DRX activetime. FIG. 16A and FIG. 16B show examples of the wake-up mechanism.

In FIG. 16A, a gNB may transmit one or more messages comprisingparameters of a wake-up duration (or a power saving duration), to a UE.The wake-up duration may be located a number of slots (or symbols)before a DRX On duration of a DRX cycle. The number of slots (orsymbols), or, referred to as a gap between a wakeup duration and a DRXon duration, may be configured in the one or more RRC messages orpredefined as a fixed value. The gap may be used for at least one of:synchronization with the gNB; measuring reference signals; and/orretuning RF parameters. The gap may be determined based on a capabilityof the UE and/or the gNB. In an example, the wake-up mechanism may bebased on a wake-up signal. The parameters of the wake-up duration maycomprise at least one of: a wake-up signal format (e.g., numerology,sequence length, sequence code, etc.); a periodicity of the wake-upsignal; a time duration value of the wake-up duration; a frequencylocation of the wake-up signal. In LTE Re.15 specification, the wake-upsignal for paging may comprise a signal sequence (e.g., Zadoff-Chusequence) generated based on a cell identification (e.g., cell ID) as:

${w(m)} = {{\theta_{n_{f},n_{s}}(m)} \cdot {e^{- \frac{j\; \pi \; {{un}{({n + 1})}}}{131}}.}}$

In the example, m=0, 1, . . . , 132M−1, and n=m mod 132.

In an example,

${\theta_{n_{f},n_{s}}(m)} = \left\{ {\begin{matrix}{1,{{{if}\mspace{14mu} {c_{n_{f},n_{s}}\left( {2m} \right)}} = {{0\mspace{14mu} {and}\mspace{14mu} {c_{n_{f},n_{s}}\left( {{2m} + 1} \right)}} = 0}}} \\{{- 1},{{{if}\mspace{14mu} {c_{n_{f},n_{s}}\left( {2m} \right)}} = {{0\mspace{14mu} {and}\mspace{14mu} {c_{n_{f},n_{s}}\left( {{2m} + 1} \right)}} = 1}}} \\{j,{{{if}\mspace{14mu} {c_{n_{f},n_{s}}\left( {2m} \right)}} = {{1\mspace{14mu} {and}\mspace{14mu} {c_{n_{f},n_{s}}\left( {{2m} + 1} \right)}} = 0}}} \\{{- j},{{{if}\mspace{14mu} {c_{n_{f},n_{s}}\left( {2m} \right)}} = {{1\mspace{14mu} {and}\mspace{14mu} {c_{n_{f},n_{s}}\left( {{2m} + 1} \right)}} = 1}}}\end{matrix},} \right.$

where u=(N_(ID) ^(cell) mod 126)+3. N_(ID) ^(cell) may be a cell ID ofthe serving cell. M may be a number of subframes in which the WUS may betransmitted, 1≤M≤M_(WSUmax), where M_(WUSsmax) is the maximum number ofsubframes in which the WUS may be transmitted. c_(n) _(i) _(,n) _(s)(i), i=0, 1, . . . , 2·132M−1 may be a scrambling sequence (e.g., alength-31 Gold sequence), which may be initialized at start oftransmission of the WUS with:

${c_{{init}\_ {WUS}} = {{\left( {N_{ID}^{cell} + 1} \right)\left( {{\left( {{10n_{{f\_ {start}}{\_ {PO}}}} + \left\lfloor \frac{n_{{s\_ {start}}{\_ {PO}}}}{2} \right\rfloor} \right)\mspace{20mu} {mod}\mspace{14mu} 2048} + 1} \right)2^{9}} + N_{ID}^{cell}}},$

where n_(f_start_PO) is the first frame of a first paging occasion towhich the WUS is associated, and n_(s_start_PO) is a first slot of thefirst paging occasion to which the WUS is associated.

In an example, the parameters of the wake-up duration may be pre-definedwithout RRC configuration. In an example, the wake-up mechanism may bebased on a wake-up channel (e.g., a PDCCH, or a DCI). The parameters ofthe wake-up duration may comprise at least one of: a wake-up channelformat (e.g., numerology, DCI format, PDCCH format); a periodicity ofthe wake-up channel; a control resource set and/or a search space of thewake-up channel. When configured with the parameters of the wake-upduration, the UE may monitor the wake-up signal or the wake-up channelduring the wake-up duration. In response to receiving the wake-upsignal/channel, the UE may wake-up to monitor PDCCHs as expectedaccording to the DRX configuration. In an example, in response toreceiving the wake-up signal/channel, the UE may monitor PDCCHs in theDRX active time (e.g., when drx-onDurationTimer is running). The UE maygo back to sleep if not receiving PDCCHs in the DRX active time. The UEmay keep in sleep during the DRX off duration of the DRX cycle. In anexample, if the UE doesn't receive the wake-up signal/channel during thewake-up duration, the UE may skip monitoring PDCCHs during the DRXactive time. This mechanism may reduce power consumption for PDCCHmonitoring during the DRX active time. In the example, during thewake-up duration, a UE may monitor the wake-up signal/channel only.During the DRX off duration, the UE may stop monitoring PDCCHs and thewake-up signal/channel. During the DRX active duration, the UE maymonitor PDCCHs except of the wake-up signal/channel, if receiving thewake-up signal/channel in the wake-up duration. In an example, the gNBand/or the UE may apply the wake-up mechanism in paging operation whenthe UE is in an RRC_idle state or an RRC_inactive state, or in aconnected DRX operation (C-DRX) when the UE is in an RRC_CONNECTEDstate.

In an example, a wake-up mechanism may be based on a go-to-sleepsignal/channel. FIG. 16B shows an example. A gNB may transmit one ormore messages comprising parameters of a wake-up duration (or a powersaving duration), to a UE. The one or more messages may comprise atleast one RRC message. The at least one RRC message may comprise one ormore cell-specific or cell-common RRC messages (e.g., ServingCellConfigIE, ServingCellConfigCommon IE, MAC-CellGroupConfig IE). The wake-upduration may be located a number of slots (or symbols) before a DRX Onduration of a DRX cycle. The number of slots (or symbols) may beconfigured in the one or more RRC messages or predefined as a fixedvalue. In an example, the wake-up mechanism may be based on ago-to-sleep signal. The parameters of the wake-up duration may compriseat least one of: a go-to-sleep signal format (e.g., numerology, sequencelength, sequence code, etc.); a periodicity of the go-to-sleep signal; atime duration value of the wake-up duration; a frequency location of thego-to-sleep signal. In an example, the wake-up mechanism may be based ona go-to-sleep channel (e.g., a PDCCH, or a DCI). The parameters of thewake-up duration may comprise at least one of: a go-to-sleep channelformat (e.g., numerology, DCI format, PDCCH format); a periodicity ofthe go-to-sleep channel; a control resource set and/or a search space ofthe go-to-sleep channel. When configured with the parameters of thewake-up duration, the UE may monitor the go-to-sleep signal or thego-to-sleep channel during the wake-up duration. In response toreceiving the go-to-sleep signal/channel, the UE may go back to sleepand skip monitoring PDCCHs during the DRX active time. In an example, ifthe UE doesn't receive the go-to-sleep signal/channel during the wake-upduration, the UE may monitor PDCCHs during the DRX active time. Thismechanism may reduce power consumption for PDCCH monitoring during theDRX active time. In an example, compared with a wake-up signal basedwake-up mechanism, a go-to-sleep signal based mechanism may be morerobust to detection error. If the UE miss detects the go-to-sleepsignal, the consequence is that the UE may wrongly start monitoringPDCCH, which may result in extra power consumption. However, if the UEmiss detects the wake-up signal, the consequence is that the UE may missa DCI which may be addressed to the UE. In the case, missing the DCI mayresult in communication interruption. In some cases (e.g., URLLC serviceor V2X service), the UE and/or the gNB may not allow communicationinterruption compared with extra power consumption.

In an example, a NR wireless device when configured with multiple cellsmay spend more power than an LTE-A wireless device, for communicationwith a base station. The NR wireless device may communicate with a NRbase station on cells operating in high frequency (e.g., 6 GHz, 30 GHz,or 70 GHz), with more power consumption than the LTE-A wireless deviceoperating in low frequency (e.g., <=6 GHz). In a NR system, a basestation may transmit to, and/or receive from a wireless device, datapackets of a plurality of data services (e.g., web browsing, videostreaming, industry IoT, and/or communication services for automation ina variety of vertical domains). The plurality of data services may havedifferent data traffic patterns (e.g., periodic, aperiodic, data arrivalpattern, event-trigger, small data size, or burst type). In an example,a first data service (e.g., having a predicable/periodic trafficpattern) may be suitable for a wireless device to enable a power savingbased communication with a base station, especially when the wirelessdevice operates in the high frequency. In an example, when the wirelessdevice changes a data service from the first data service to a seconddata service which is not suitable for power saving, a mechanism forsemi-statically/dynamically disabling the power saving may be beneficialfor a quick data packet delivery as expected.

In an example, a base station may transmit to a wireless device one ormore RRC messages comprising configuration parameters of a power savingmode. The one or more RRC messages may comprise one or morecell-specific or cell-common RRC messages (e.g., ServingCellConfig IE,ServingCellConfigCommon IE, MAC-CellGroupConfig IE). The one or more RRCmessages may comprise: RRC connection reconfiguration message (e.g.,RRCReconfiguration); RRC connection reestablishment message (e.g.,RRCRestablishment); and/or RRC connection setup message (e.g.,RRCSetup). In an example, the cell may be a primary cell (e.g., PCell),a PUCCH secondary cell if secondary PUCCH group is configured, or aprimary secondary cell (e.g., PSCell) if dual connectivity isconfigured. The cell may be identified by (or associated with) a cellspecific identity (e.g., cell ID).

In an example, the configuration parameters may comprise parameters ofat least one power saving mode configuration on the cell. Each of the atleast one power saving mode configuration may be identified by a powersaving mode configuration identifier (index, indicator, or ID).

In an example, a power saving mode of a power saving mode configurationmay be based on a power saving signal (e.g., a wake-up signal as shownin FIG. 16A, and/or a go-to-sleep as shown in FIG. 16B). The parametersof a power saving signal-based power saving mode configuration maycomprise at least one of: a signal format (e.g., numerology) of thepower saving signal; sequence generation parameters (e.g., a cell id, avirtual cell id, SS block index, or an orthogonal code index) forgenerating the power saving signal; a window size of a time windowindicating a duration when the power saving signal may be transmitted; avalue of a periodicity of the transmission of the power saving signal; atime resource on which the power saving signal may be transmitted; afrequency resource on which the power saving signal may be transmitted;a BWP on which the wireless device may monitor the power saving signal;and/or a cell on which the wireless device may monitor the power savingsignal. In an example, the power saving signal may comprise at least oneof: a SS block; a CSI-RS; a DMRS; and/or a signal sequence (e.g.,Zadoff-Chu, M sequence, or gold sequence).

In an example, a power saving mode may be based on a power savingchannel (e.g., a wake-up channel (WUCH)). The power saving channel maycomprise a downlink control channel (e.g., a PDCCH) dedicated for thepower saving mode. The parameters of a power saving channel-based powersaving mode configuration may comprise at least one of: a time windowindicating a duration when the base station may transmit a power savinginformation (e.g., a wake-up information, or a go-to-sleep information)via the power saving channel; parameters of a control resource set(e.g., time, frequency resource and/or TCI state indication of the powersaving channel); a periodicity of the transmission of the power savingchannel; a DCI format of the power saving information; a BWP on whichthe wireless device may monitor the power saving channel; and/or a cellon which the wireless device may monitor the power saving channel.

In an example, the wireless device in an RRC connected state maycommunicate with the base station in a full function mode (or a normalfunction mode). In the full function mode, the wireless device maymonitor PDCCHs continuously if a DRX operation is not configured to thewireless device. In the full function mode, the wireless device maymonitor the PDCCHs discontinuously by applying one or more DRXparameters of the DRX operation if the DRX operation is configured. Inthe full function mode (e.g., power saving mode), the wireless devicemay: monitor PDCCHs; transmit SRS; transmit on RACH; transmit on UL-SCH;and/or receive DL-SCH.

A base station may configure a wireless device with a list of one ormore TCI-State configurations by a higher layer parameter PDSCH-Configfor a serving cell. A number of the one or more TCI states may depend ona capability of the wireless device. The wireless device may use the oneor more TCI-States to decode a PDSCH according to a detected PDCCH witha DCI. The DCI may be intended for the wireless device and a servingcell of the wireless device.

In an example, a TCI state of the one or more TCI-State configurationsmay contain one or more parameters. The wireless device may use the oneor more parameters to configure a quasi co-location relationship betweenone or two downlink reference signals (e.g., first DL RS and second DLRS) and DM-RS ports of a PDSCH. The quasi co-location relationship maybe configured by a higher layer parameter qcl-Type1 for the first DL RS.The quasi co-location relationship may be configured by a higher layerparameter qcl-Type2 for the second DL RS (if configured).

In an example, when the wireless device configures a quasi co-locationrelationship between the two downlink reference signals (e.g., first DLRS and second DL RS), a first QCL type of the first DL RS and a secondQCL type of the second DL RS may not be the same. In an example, thefirst DL RS and the second DL RS may be the same. In an example, thefirst DL RS and the second DL RS may be different.

In an example, a quasi co-location type (e.g., the first QCL type, thesecond QCL type) of a DL RS (e.g., the first DL RS, the second DL RS)may be provided to the wireless device by a higher layer parameterqcl-Type in QCL-Info. The higher layer parameter QCL-Type may take atleast one of: QCL-TypeA: {Doppler shift, Doppler spread, average delay,delay spread}; QCL-TypeB: {Doppler shift, Doppler spread}; QCL-TypeC:{average delay, Doppler shift} and QCL-TypeD: {Spatial Rx parameter}.

In an example, a wireless device may receive an activation command. Theactivation command may be used to map one or more TCI states (e.g., upto 8) to one or more codepoints of a DCI field “TransmissionConfiguration Indication (TCI)”. In an example, the wireless device maytransmit a HARQ-ACK corresponding to a PDSCH in slot n. The PDSCH maycomprise/carry the activation command. In response to the transmittingthe HARQ-ACK in the slot n, the wireless device may apply the mappingbetween the one or more TCI states and the one or more codepoints of theDCI field “Transmission Configuration Indication” starting from slotn+3N_(slot) ^(subframe,μ)+1.

In an example, after the wireless device receives an initial higherlayer configuration of one or more TCI states and before the receptionof the activation command, the wireless device may assume that one ormore DM-RS ports of a PDSCH of a serving cell are quasi co-located withan SSB/PBCH block. In an example, the wireless device may determine theSSB/PBCH block in an initial access procedure with respect ‘QCL-TypeA’.In an example, the wireless device may determine the SSB/PBCH block inthe initial access procedure with respect to ‘QCL-TypeD’ (whenapplicable).

In an example, a wireless device may be configured, by a base station,with a higher layer parameter TCI-PresentInDCI. When the higher layerparameter TCI-PresentInDCI is set as ‘enabled’ for a control resourceset (coreset) scheduling a PDSCH, the wireless device may assume that aTCI field is present in a DCI format (e.g., DCI format 1_1) of a PDCCHtransmitted on the CORESET.

In an example, a base station may not configure a coreset with a higherlayer parameter TCI-PresentInDCI. In an example, the coreset mayschedule a PDSCH. In an example, a time offset between a reception of aDCI (e.g., DCI format 1_1, DCI format 1_0) received in the coreset andthe (corresponding) PDSCH may be equal to or greater than a threshold(e.g., Threshold-Sched-Offset). In an example, the threshold may bebased on a reported UE capability. In an example, the wireless devicemay apply a second TCI state for the coreset used for a PDCCHtransmission of the DCI. In an example, the wireless device may apply asecond QCL assumption for the coreset used for a PDCCH transmission ofthe DCI. In an example, in response to the base station not configuringthe coreset with the higher layer parameter TCI-PresentInDCI and thetime offset between the reception of the DCI and the PDSCH being equalor greater than the threshold, the wireless device may perform a defaultPDSCH RS selection. In an example, in the default PDSCH RS selection,the wireless device may assume, in order to determine antenna port quasico-location of the PDSCH, that a first TCI state or a first QCLassumption for the PDSCH is identical to the second TCI state or thesecond QCL assumption applied for the coreset.

In an example, a base station may configure a coreset with a higherlayer parameter TCI-PresentInDCI. In an example, the higher layerparameter TCI-PresentInDCI may be set as “enabled”. In an example, thecoreset may schedule a PDSCH with a DCI (e.g., DCI format 1_0). In anexample, the DCI may not comprise a TCI field. In an example, a timeoffset between a reception of the DCI received in the coreset and the(corresponding) PDSCH may be equal to or greater than a threshold (e.g.,Threshold-Sched-Offset). In an example, the threshold may be based on areported UE capability. In an example, the wireless device may apply asecond TCI state for the coreset used for a PDCCH transmission of theDCI. In an example, the wireless device may apply a second QCLassumption for the coreset used for a PDCCH transmission of the DCI. Inan example, in response to the base station scheduling the PDSCH withthe DCI not comprising the TCI field and the time offset between thereception of the DCI and the PDSCH being equal or greater than thethreshold, the wireless device may perform a default PDSCH RS selection.In an example, in the default PDSCH RS selection, the wireless devicemay assume, in order to determine antenna port quasi co-location of thePDSCH, that a first TCI state or a first QCL assumption for the PDSCH isidentical to the second TCI state or the second QCL assumption appliedfor the coreset.

In an example, a base station may configure a coreset with a higherlayer parameter TCI-PresentInDCI. In an example, the higher layerparameter TCI-PresentInDCI may be set as “enabled”. The wireless devicemay receive a DCI in the coreset of a scheduling component carrier. TheDCI may comprise a TCI field. In response to the higher layer parameterTCI-PresentinDCI being set as ‘enabled’, the TCI field in the DCI in thescheduling component carrier may point to one or more activated TCIstates (e.g., after receiving the activation command) in a scheduledcomponent carrier or in a DL BWP.

In an example, a base station may configure a coreset with a higherlayer parameter TCI-PresentInDCI. In an example, the higher layerparameter TCI-PresentInDCI may be set as “enabled”. The wireless devicemay receive a DCI (e.g., DCI format 1_1) in the coreset. In an example,the DCI may schedule a PDSCH of a wireless device. In an example, a TCIfield may be present in the DCI. In an example, a time offset between areception of the DCI and the (corresponding scheduled) PDSCH may beequal to or greater than a threshold (e.g., Threshold-Sched-Offset). Inan example, the threshold may be based on a reported UE capability. Inan example, in response to the TCI field being present in the DCIscheduling the PDSCH and the higher layer parameter TCI-PresentinDCIbeing set as ‘enabled’ for the coreset, the wireless device may, inorder to determine antenna port quasi co-location for the PDSCH, use aTCI State according to a value of the TCI field in a detected PDCCH withthe DCI. In an example, the using the TCI State according to the valueof the TCI field may comprise that the wireless device may assume thatone or more DM-RS ports of the PDSCH of a serving cell are quasico-located with one or more RS(s) in the TCI State with respect to oneor more QCL type parameter(s) given by the TCI state when the timeoffset between the reception of the DCI and the PDSCH is equal orgreater than the threshold. In an example, the value of the TCI fieldmay indicate the TCI state.

In an example, a base station may configure a wireless device with asingle slot PDSCH. In an example, the single slot PDSCH may be scheduledin a slot. In an example, the base station may activate one or more TCIstates in the slot. In response to being configured with the single slotPDSCH, a TCI state (e.g., indicated by a TCI field in a DCI schedulingthe single slot PDSCH) may be based on the one or more activated TCIstates in the slot with the scheduled single slot PDSCH. In an example,the TCI state may be one of the one or more activated TCI states in theslot. In an example, the TCI field in the DCI may indicate a TCI stateof the one or more activated TCI states in the slot.

In an example, a wireless device may be configured with a coreset. In anexample, the coreset may be associated with a search space set forcross-carrier scheduling. In an example, in response to the coresetbeing associated with the search space set for cross-carrier scheduling,the wireless device may expect the higher layer parameterTCI-PresentInDCI set as ‘enabled’ for the coreset. In an example, a basestation may configure a serving cell with one or more TCI states. In anexample, the wireless device may detect, in the search space set, aPDCCH, with a DCI, scheduling a PDSCH. In an example, a TCI field in theDCI may indicate at least one of the one or more TCI states. In anexample, the at least one of the one more TCI states (scheduled by thesearch space set) may comprise/contain a QCL type (e.g., QCL-TypeD). Inan example, in response to the at least one of the one or more TCIstates scheduled by the search space set containing the QCL type, thewireless device may expect a time offset between a reception of thePDCCH detected in the search space set and the (corresponding) PDSCH islarger than or equal to the threshold (e.g., Threshold-Sched-Offset).

In an example, a base station may configure a coreset with a higherlayer parameter TCI-PresentInDCI. In an example, the higher layerparameter TCI-PresentInDCI may be set as “enabled”. In an example, whenthe higher layer parameter TCI-PresentInDCI is set to ‘enabled’ for thecoreset, an offset between a reception of a DCI in the coreset and aPDSCH scheduled by the DCI may be less than the threshold (e.g.,Threshold-Sched-Offset).

In an example, a base station may not configure a coreset with a higherlayer parameter TCI-PresentInDCI. In an example, the wireless device maybe in an RRC connected mode. In an example, the wireless device may bein an RRC idle mode. In an example, the wireless device may be in an RRCinactive mode. In an example, when the higher layer parameterTCI-PresentInDCI is not configured for the coreset, an offset between areception of a DCI in the coreset and a PDSCH scheduled by the DCI maybe lower than the threshold (e.g., Threshold-Sched-Offset).

In an example, a wireless device may monitor one or more coresets (orone or more search spaces) within/in an active BWP (e.g., activedownlink BWP) of a serving cell in one or more slots. In an example, themonitoring the one or more coresets within/in the active BWP of theserving cell in the one or more slots may comprise monitoring at leastone coreset within/in the active BWP of the serving cell in each slot ofthe one or more slots. In an example, a latest slot of the one or moreslots may occur latest in time. In an example, the wireless device maymonitor, within/in the active BWP of the serving cell, one or moresecond coresets of the one or more coresets in the latest slot. Inresponse to the monitoring the one or more second coresets in the latestslot and the latest slot occurring latest in time, the wireless devicemay determine the latest slot. In an example, each coreset of the one ormore second coresets may be identified by a coreset specific index(e.g., indicated by a higher layer CORESET-ID). In an example, a coresetspecific index of a coreset of the one or more secondary coresets may bethe lowest among the coreset specific indices of the one or more secondcoresets. In an example, the wireless device may monitor a search spaceassociated with the coreset in the latest slot. In an example, inresponse to the coreset specific index of the coreset being the lowestand the monitoring the search space associated with the coreset in thelatest slot, the wireless device may select the coreset of the one ormore secondary coresets.

In an example, when the offset between the reception of the DCI in thecoreset and the PDSCH scheduled by the DCI is lower than the threshold(e.g., Threshold-Sched-Offset), the wireless device may perform adefault PDSCH RS selection. In an example, in the default PDSCH RSselection, the wireless device may assume that one or more DM-RS portsof the PDSCH of a serving cell are quasi co-located with one or more RSsin a TCI state with respect to one or more QCL type parameter(s). Theone or more RSs in the TCI state may be used for PDCCH quasi co-locationindication of the (selected) coreset of the one or more second coresets.

In an example, a wireless device may receive a DCI via a PDCCH in acoreset. In an example, the DCI may schedule a PDSCH. In an example, anoffset between a reception of the DCI and the PDSCH may be less than athreshold (e.g., Threshold-Sched-Offset). A first QCL type (e.g.,‘QCL-TypeD’) of one or more DM-RS ports of the PDSCH may be differentfrom a second QCL type (e.g., ‘QCL-TypeD’) of one or more second DM-RSports of the PDCCH. In an example, the PDSCH and the PDCCH may overlapin at least one symbol. In an example, in response to the PDSCH and thePDCCH overlapping in at least one symbol and the first QCL type beingdifferent from the second QCL type, the wireless device may prioritize areception of the PDCCH associated with the coreset. In an example, theprioritizing may apply to an intra-band CA case (when the PDSCH and thecoreset are in different component carriers). In an example, theprioritizing the reception of the PDCCH may comprise receiving the PDSCHwith the second QCL type of one or more second DM-RS ports of the PDCCH.In an example, the prioritizing the reception of the PDCCH may compriseoverwriting the first QCL type of the one or more DM-RS ports of thePDSCH with the second QCL type of the one or more second DM-RS ports ofthe PDCCH. In an example, the prioritizing the reception of the PDCCHmay comprise assuming a spatial QCL of the PDCCH (e.g., the second QCLtype), for the simultaneous reception of the PDCCH and PDSCH, on thePDSCH. In an example, the prioritizing the reception of the PDCCH maycomprise applying a spatial QCL of the PDCCH (e.g., the second QCLtype), for the simultaneous reception of the PDCCH and PDSCH, on thePDSCH.

In an example, none of the configured TCI states may contain a QCL type(e.g., ‘QCL-TypeD’). In response to the none of the configured TCIstates containing the QCL type, the wireless device may obtain the otherQCL assumptions from the indicated TCI states for its scheduled PDSCHirrespective of the time offset between the reception of the DCI and thecorresponding PDSCH.

In an example, a wireless device may use CSI-RS for at least one of:time/frequency tracking, CSI computation, L1-RSRP computation andmobility.

In an example, a base station may configure a wireless device to monitora coreset on one or more symbols. In an example, a CSI-RS resource maybe associated with a NZP-CSI-RS-ResourceSet. A higher layer parameterrepetition of the NZP-CSI-RS-ResourceSet may be set to ‘on’. In anexample, in response to the CSI-RS resource being associated with theNZP-CSI-RS-ResourceSet with the higher layer parameter repetition set to‘on’, the wireless device may not expect to be configured with a CSI-RSof the CSI-RS resource over the one or more symbols.

In an example, a higher layer parameter repetition of theNZP-CSI-RS-ResourceSet may not be set to ‘on’. In an example, a basestation may configure a CSI-RS resource and one or more search spacesets associated with a coreset in the same one or more symbols (e.g.,OFDM symbols). In an example, in response to the higher layer parameterrepetition of the NZP-CSI-RS-ResourceSet not being set to ‘on’, and theCSI-RS resource and the one or more search space sets associated withthe coreset being configured in the same one or more symbols, thewireless device may assume that a CSI-RS of the CSI-RS resource and oneor more DM-RS ports of a PDCCH are quasi co-located with ‘QCL-TypeD’. Inan example, the base station may transmit the PDCCH in the one or moresearch space sets associated with the coreset.

In an example, a higher layer parameter repetition of theNZP-CSI-RS-ResourceSet may not be set to ‘on’. In an example, a basestation may configure a CSI-RS resource of a first cell and one or moresearch space sets associated with a coreset of a second cell in the sameone or more symbols (e.g., OFDM symbols). In an example, in response tothe higher layer parameter repetition of the NZP-CSI-RS-ResourceSet notbeing set to ‘on’, and the CSI-RS resource and the one or more searchspace sets associated with the coreset being configured in the same oneor more symbols, the wireless device may assume that a CSI-RS of theCSI-RS resource and one or more DM-RS ports of a PDCCH are quasico-located with ‘QCL-TypeD’. In an example, the base station maytransmit the PDCCH in the one or more search space sets associated withthe coreset. In an example, the first cell and the second cell may be indifferent intra-band component carriers.

In an example, a base station may configure a wireless device with aCSI-RS in a first set of PRBs. In an example, the base station mayconfigure the wireless device with one or more search space setsassociated with a coreset in one or more symbols (e.g., OFDM symbols)and in a second set of PRBs. In an example, the wireless device may notexpect the first set of PRBs sand the second set of PRBs overlapping inthe one or more symbols.

In an example, a base station may configure a wireless device with aCSI-RS resource and an SS/PBCH block in the same one or more (OFDM)symbols. In an example, in response to the CSI-RS resource and theSS/PBCH block being configured in the same one or more (OFDM) symbols,the wireless device may assume that the CSI-RS resource and the SS/PBCHblock are quasi co-located with a QCL type (e.g., ‘QCL-TypeD’).

In an example, the base station may configure the CSI-RS resource in afirst set of PRBs for the wireless device. In an example, the basestation may configure the SS/PBCH block in a second set of PRBs for thewireless device. In an example, the wireless device may not expect thefirst set of PRBs overlapping with the second set of PRBs.

In an example, the base station may configure the CSI-RS resource with afirst subcarrier spacing for the wireless device. In an example, thebase station may configure the SS/PBCH block with a second subcarrierspacing for the wireless device. In an example, the wireless device mayexpect the first subcarrier spacing and the second subcarrier spacingbeing the same.

In an example, a base station may configure a wireless device with aNZP-CSI-RS-ResourceSet. In an example, the NZP-CSI-RS-ResourceSet may beconfigured with a higher layer parameter repetition set to ‘on’. In anexample, in response to the NZP-CSI-RS-ResourceSet being configured withthe higher layer parameter repetition set to ‘on’, the wireless devicemay assume that the base station transmits one or more CSI-RS resourceswithin the NZP-CSI-RS-ResourceSet with the same downlink spatial domaintransmission filter. In an example, the base station may transmit eachCSI-RS resource of the one or more CSI-RS resources in different symbols(e.g., OFDM symbols).

In an example, the NZP-CSI-RS-ResourceSet may be configured with ahigher layer parameter repetition set to ‘off’. In an example, inresponse to the NZP-CSI-RS-ResourceSet being configured with the higherlayer parameter repetition set to ‘off’, the wireless device may notassume that the base station transmits one or more CSI-RS resourceswithin the NZP-CSI-RS-ResourceSet with the same downlink spatial domaintransmission filter.

In an example, a base station may configure a wireless device with ahigher layer parameter groupBasedBeamReporting. In an example, the basestation may set the higher layer parameter groupBasedBeamReporting to“enabled”. In response to the higher layer parametergroupBasedBeamReporting set to “enabled”, the wireless device may reportat least two different resource indicators (e.g., CRI, SSBRI) in asingle reporting instance for a reporting setting of one or more reportsettings. In an example, the wireless device may receive at least twoRSs (e.g., CSI-RS, SSB) indicated by the at least two different resourceindicators simultaneously. In an example, the wireless device mayreceive the at least two RSs simultaneously with a single spatial domainreceive filter. In an example, the wireless device may receive the atleast two RSs simultaneously with a plurality of simultaneous spatialdomain receive filters.

In an example, a base station may need (additional) one or more UE radioaccess capability information of a wireless device. In response to theneeding the one or more UE radio access capability information, the basestation may initiate a procedure to request the one or more UE radioaccess capability information (e.g., by an information elementUECapabilityEnquiry) from the wireless device. In an example, thewireless device may use an information element (e.g.,UECapabilityInformation message) to transfer one or more UE radio accesscapability information requested by the base station. In an example, thewireless device may provide a threshold (e.g., timeDurationForQCL,Threshold-Sched-Offset) in FeatureSetDownlink indicating a set offeatures that the wireless device supports.

In an example, the threshold may comprise a minimum number of OFDMsymbols required by the wireless device to perform a PDCCH receptionwith a DCI and to apply a spatial QCL information (e.g., TCI-State)received in (or indicated by) the DCI for a processing of a PDSCHscheduled by the DCI.

In an example, the wireless device may require the minimum number ofOFDM symbols between the PDCCH reception and the processing of the PDSCHto apply the spatial QCL information, indicated by the DCI, to the PDSCH

In an example, a wireless device may be configured, by a base station,with one or more serving cells. In an example, the base station mayactivate one or more second serving cells of the one or more servingcells. In an example, the base station may configure each activatedserving cell of the one or more second serving cells with a respectivePDCCH monitoring. In an example, the wireless device may monitor a setof PDCCH candidates in one or more coresets on an active DL BWP of eachactivated serving cell configured with the respective PDCCH monitoring.In an example, the wireless device may monitor the set of PDCCHcandidates in the one or more coresets according to corresponding searchspace sets. In an example, the monitoring may comprise decoding eachPDCCH candidate of the set of PDCCH candidates according to monitoredDCI formats.

In an example, a set of PDCCH candidates for a wireless device tomonitor may be defined in terms of PDCCH search space sets. In anexample, a search space set may be a common search space (CSS) set or aUE specific search space (USS) set.

In an example, one or more PDCCH monitoring occasions may be associatedwith a SS/PBCH block. In an example, the SS/PBCH block may bequasi-co-located with a CSI-RS. In an example, a TCI state of an activeBWP may comprise the CSI-RS. In an example, the active BWP may comprisea coreset identified with index being equal to zero (e.g., Coresetzero). In an example, the wireless device may determine the TCI state bythe most recent of: an indication by a MAC CE activation command or arandom-access procedure that is not initiated by a PDCCH order thattriggers a non-contention based random access procedure. In an example,for a DCI format with CRC scrambled by a C-RNTI, a wireless device maymonitor corresponding PDCCH candidates at the one or more PDCCHmonitoring occasions in response to the one or more PDCCH monitoringoccasions being associated with the SS/PBCH block.

In an example, a base station may configure a wireless device with oneor more DL BWPs in a serving cell. In an example, for a DL BWP of theone or more DL BWPs, the wireless device may be provided by a higherlayer signaling with one or more (e.g., 2, 3) control resource sets(coresets). For a coreset of the one or more coresets, the base stationmay provide the wireless device, by a higher layer parameterControlResourceSet, at least one of: a coreset index (e.g., provided byhigher layer parameter controlResourceSetId), a DMRS scrambling sequenceinitialization value (e.g., provided by a higher layer parameterpdcch-DMRS-ScramblingID); a number of consecutive symbols (e.g.,provided by a higher layer parameter duration), a set of resource blocks(e.g., provided by higher layer parameter frequencyDomainResources),CCE-to-REG mapping parameters (e.g., provided by higher layer parametercce-REG-MappingType), an antenna port quasi co-location (e.g., from aset of antenna port quasi co-locations provided by a first higher layerparameter tci-StatesPDCCH-ToAddList and a second higher layer parametertci-StatesPDCCH-ToReleaseList), and an indication for a presence orabsence of a transmission configuration indication (TCI) field for a DCIformat (e.g., DCI format 1_1) transmitted by a PDCCH in the coreset(e.g., provided by higher layer parameter TCI-PresentInDCI). In anexample, the antenna port quasi co-location may indicate a quasico-location information of one or more DM-RS antenna ports for a PDCCHreception in the coreset. In an example, the coreset index may be uniqueamong the one or more DL BWPs of the serving cell. In an example, whenthe higher layer parameter TCI-PresentInDCI is absent, the wirelessdevice may consider that a TCI field is absent/disabled in the DCIformat.

In an example, a first higher layer parameter tci-StatesPDCCH-ToAddListand a second higher layer parameter tci-StatesPDCCH-ToReleaseList mayprovide a subset of TCI states defined in pdsch-Config. In an example,the wireless device may use the subset of the TCI states to provide oneor more QCL relationships between one or more RS in a TCI state of thesubset of the TCI states and one or more DM-RS ports of a PDCCHreception in the coreset.

In an example, a base station may configure a coreset for a wirelessdevice. In an example, a coreset index (e.g., provided by higher layerparameter controlResourceSetId) of the coreset may be non-zero. In anexample, the base station may not provide the wireless device with aconfiguration of one or more TCI states, by a first higher layerparameter tci-StatesPDCCH-ToAddList and/or a second higher layerparameter tci-StatesPDCCH-ToReleaseList, for the coreset. In an example,in response to not being provided with the configuration of the one ormore TCI states for the coreset, the wireless device may assume that oneor more DMRS antenna ports for a PDCCH reception in the coreset is quasico-located with an RS (e.g., SS/PBCH block). In an example, the wirelessdevice may identify the RS during an initial access procedure.

In an example, a base station may configure a coreset for a wirelessdevice. In an example, a coreset index (e.g., provided by higher layerparameter controlResourceSetId) of the coreset may be non-zero. In anexample, the base station may provide the wireless device with aninitial configuration of at least two TCI states, by a first higherlayer parameter tci-StatesPDCCH-ToAddList and/or a second higher layerparameter tci-StatesPDCCH-ToReleaseList, for the coreset. In an example,the wireless device may receive the initial configuration of the atleast two TCI states from the base station. In an example, the wirelessdevice may not receive a MAC CE activation command for at least one ofthe at least two TCI states for the coreset. In an example, in responseto being provided with the initial configuration for the coreset and notreceiving the MAC CE activation command for the coreset, the wirelessdevice may assume that one or more DMRS antenna ports for a PDCCHreception in the coreset is quasi co-located with an RS (e.g., SS/PBCHblock). In an example, the wireless device may identify the RS during aninitial access procedure.

In an example, a base station may configure a coreset for a wirelessdevice. In an example, a coreset index (e.g., provided by higher layerparameter controlResourceSetId) of the coreset may be equal to zero. Inan example, the wireless device may not receive a MAC CE activationcommand for a TCI state for the coreset. In response to not receivingthe MAC CE activation command, the wireless device may assume that oneor more DMRS antenna ports for a PDCCH reception in the coreset is quasico-located with an RS (e.g., SS/PBCH block). In an example, the wirelessdevice may identify the RS during an initial access procedure. In anexample, the wireless device may identify the RS from a most recentrandom-access procedure. In an example, the wireless device may notinitiate the most recent random-access procedure in response toreceiving a PDCCH order triggering a non-contention based random-accessprocedure.

In an example, a base station may provide a wireless device with asingle TCI state for a coreset. In an example, the base station mayprovide the single TCI state by a first higher layer parametertci-StatesPDCCH-ToAddList and/or a second higher layer parametertci-StatesPDCCH-ToReleaseList. In response to being provided with thesingle TCI state for the coreset, the wireless device may assume thatone or more DM-RS antenna ports for a PDCCH reception in the coreset isquasi co-located with one or more DL RSs configured by the single TCIstate.

In an example, a base station may configure a coreset for a wirelessdevice. In an example, the base station may provide the wireless devicewith a configuration of at least two TCI states, by a first higher layerparameter tci-StatesPDCCH-ToAddList and/or a second higher layerparameter tci-StatesPDCCH-ToReleaseList, for the coreset. In an example,the wireless device may receive the configuration of the at least twoTCI states from the base station. In an example, the wireless device mayreceive a MAC CE activation command for at least one of the at least twoTCI states for the coreset. In response to the receiving the MAC CEactivation command for the at least one of the at least two TCI states,the wireless device may assume that one or more DM-RS antenna ports fora PDCCH reception in the coreset is quasi co-located with one or more DLRSs configured by the at least one of the at least two TCI states.

In an example, a base station may configure a coreset for a wirelessdevice. In an example, a coreset index (e.g., provided by higher layerparameter controlResourceSetId) of the coreset may be equal to zero. Inan example, the base station may provide the wireless device with aconfiguration of at least two TCI states for the coreset. In an example,the wireless device may receive the configuration of the at least twoTCI states from the base station. In an example, the wireless device mayreceive a MAC CE activation command for at least one of the at least twoTCI states for the coreset. In an example, in response to the coresetindex being equal to zero, the wireless device may expect that a QCLtype (e.g., QCL-TypeD) of a first RS (e.g., CSI-RS) in the at least oneof the at least two TCI states is provided by a second RS (e.g., SS/PBCHblock). In an example, in response to the coreset index being equal tozero, the wireless device may expect that a QCL type (e.g., QCL-TypeD)of a first RS (e.g., CSI-RS) in the at least one of the at least two TCIstates is spatial QCL-ed with a second RS (e.g., SS/PBCH block).

In an example, a wireless device may receive a MAC CE activation commandfor at least one of at least two TCI states for a coreset. In anexample, a PDSCH may provide the MAC CE activation command. In anexample, the wireless device may transmit a HARQ-ACK information for thePDSCH in a slot. In an example, when the wireless device receives theMAC CE activation command for the at least one of the at least two TCIstates for the coreset, in response to the transmitting HARQ-ACKinformation in the slot, the wireless device may apply the MAC CEactivation command X msec (e.g., 3 msec, 5 msec) after the slot. In anexample, when the wireless device applies the MAC CE activation commandin a second slot, a first BWP may be active in the second slot. Inresponse to the first BWP being active in the second slot, the first BWPmay be an active BWP.

In an example, a base station may configure a wireless device with oneor more DL BWPs in a serving cell. In an example, for a DL BWP of theone or more DL BWPs, the wireless device may be provided by higherlayers with one or more (e.g., 3, 5, 10) search space sets. In anexample, for a search space set of the one or more search space sets,the wireless device may be provided, by a higher layer parameterSearchSpace, at least one of: a search space set index (e.g., providedby higher layer parameter searchSpaceId), an association between thesearch space set and a coreset (e.g., provided by a higher layerparameter controlResourceSetId); a PDCCH monitoring periodicity of afirst number of slots and a PDCCH monitoring offset of a second numberof slots (e.g., provided by a higher layer parametermonitoringSlotPeriodicityAndOffset); a PDCCH monitoring pattern within aslot, indicating first symbol(s) of the coreset within the slot forPDCCH monitoring, (e.g., provided by a higher layer parametermonitoringSymbolsWithinSlot); a duration of a third number of slots(e.g., provided by a higher layer parameter duration); a number of PDCCHcandidates; an indication that the search space set is either a commonsearch space set or a UE-specific search space set (e.g., provided by ahigher layer parameter searchSpaceType). In an example, the duration mayindicate a number of slots that the search space set may exist.

In an example, a wireless device may not expect two PDCCH monitoringoccasions on an active DL BWP, for a same search space set or fordifferent search space sets, in a same CORESET to be separated by anon-zero number of symbols that is smaller than the CORESET duration.

In an example, the wireless device may determine a PDCCH monitoringoccasion on an active DL BWP based on the PDCCH monitoring periodicity,the PDCCH monitoring offset, and the PDCCH monitoring pattern within aslot. In an example, for the search space set, the wireless device maydetermine that a PDCCH monitoring occasion exists in a slot. In anexample, the wireless device may monitor at least one PDCCH for thesearch space set for the duration of third number of slots (consecutive)starting from the slot.

In an example, a wireless device may monitor one or more PDCCHcandidates in a USS set on an active DL BWP of a serving cell. In anexample, a base station may not configure the wireless device with acarrier indicator field. In response to not being configured with thecarrier indicator field, the wireless device may monitor the one or morePDCCH candidates without the carrier indicator field.

In an example, a wireless device may monitor one or more PDCCHcandidates in a USS set on an active DL BWP of a serving cell. In anexample, a base station may configure the wireless device with a carrierindicator field. In response to being configured with the carrierindicator field, the wireless device may monitor the one or more PDCCHcandidates with the carrier indicator field.

In an example, a base station may configure a wireless device to monitorone or more PDCCH candidates with a carrier indicator field in a firstcell. In an example, the carrier indicator field may indicate a secondcell. In an example, the carrier indicator field may correspond to asecond cell. In response to monitoring the one or more PDCCH candidates,in the first cell, with the carrier indicator field indicating thesecond cell, the wireless device may not expect to monitor the one ormore PDCCH candidates on an active DL BWP of the second cell.

In an example, a wireless device may monitor one or more PDCCHcandidates on an active DL BWP of a serving cell. In response to themonitoring the one or more PDCCH candidates on the active DL BWP of theserving cell, the wireless device may monitor the one or more PDCCHcandidates for the serving cell.

In an example, a wireless device may monitor one or more PDCCHcandidates on an active DL BWP of a serving cell. In response to themonitoring the one or more PDCCH candidates on the active DL BWP of theserving cell, the wireless device may monitor the one or more PDCCHcandidates at least for the serving cell. In an example, the wirelessdevice may monitor the one or more PDCCH candidates for the serving celland at least a second serving cell.

In an example, a base station may configure a wireless device with oneor more cells. In an example, when a number of the one or more cells isone, the base station may configure the wireless device for asingle-cell operation. In an example, when a number of the one or morecells is more than one, the base station may configure the wirelessdevice for an operation with a carrier aggregation in a same frequencyband (e.g., intra-band).

In an example, the wireless device may monitor one or more PDCCHcandidates in overlapping PDCCH monitoring occasions in a plurality ofcoresets on active DL BWP(s) of the one or more cells. In an example,the plurality of the coresets may have a different QCL-TypeD property.

In an example, a first PDCCH monitoring occasion in a first coreset, ofthe plurality of coresets, of a first cell of the one or more cells mayoverlap with a second PDCCH monitoring occasion in a second coreset, ofthe plurality of coresets, of the first cell. In an example, thewireless device may monitor at least one first PDCCH candidate in thefirst PDCCH monitoring occasion on an active DL BWP, of the active DLBWP(s), of the first cell. In an example, the wireless device maymonitor at least one second PDCCH candidate in the second PDCCHmonitoring occasion on the active DL BWP, of the active DL BWP(s), ofthe first cell.

In an example, a first PDCCH monitoring occasion in a first coreset, ofthe plurality of coresets, of a first cell of the one or more cells mayoverlap with a second PDCCH monitoring occasion in a second coreset, ofthe plurality of coresets, of a second cell of the one or more cells. Inan example, the wireless device may monitor at least one first PDCCHcandidate in the first PDCCH monitoring occasion on a first active DLBWP, of the active DL BWP(s), of the first cell. In an example, thewireless device may monitor at least one second PDCCH candidate in thesecond PDCCH monitoring occasion on a second active DL BWP, of theactive DL BWP(s), of the second cell.

In an example, a first QCL type property (e.g., QCL-TypeD) of the firstcoreset may be different from a second QCL type property (e.g.,QCL-TypeD) of the second coreset.

In an example, in response to the monitoring the one or more PDCCHcandidates in the overlapping PDCCH monitoring occasions in theplurality of coresets and the plurality of the coresets having thedifferent QCL-TypeD property, for a coreset determination rule, thewireless device may determine a selected coreset, of the plurality ofthe coresets, of a cell of the one or more cells. In an example, inresponse to the determining, the wireless device may monitor at leastone PDCCH candidate, in the overlapping PDCCH monitoring occasions, inthe selected coreset on an active DL BWP of the cell. In an example, theselected coreset may be associated with a search space set (e.g.,association provided by a higher layer parameter controlResourceSetId).

In an example, one or more coresets of the plurality of coresets may beassociated with a CSS set. In an example, the one or more coresets ofthe plurality of coresets being associated with the CSS set may comprisethat at least one search space set of a coreset (e.g., associationbetween the at least one search space set and the coreset provided by ahigher layer parameter controlResourceSetId) of the one or more coresetshas at least one PDCCH candidate in the overlapping PDCCH monitoringoccasions and/or is a CSS set.

In an example, the first coreset may be associated with a first CSS set.In an example, the first coreset may be associated with a first USS set.In an example, the second coreset may be associated with a second CSSset. In an example, the second coreset may be associated with a secondUSS set. In an example, a coreset (e.g., the first coreset, the secondcoreset) being associated with a CSS set (e.g., first CSS set, secondCSS set) may comprise that at least one search space of the coreset isthe CSS set. In an example, a coreset (e.g., the first coreset, thesecond coreset) being associated with an USS set (e.g., first USS set,second USS set) may comprise that at least one search space of thecoreset is the USS set.

In an example, when the first coreset is associated with the first CSSset and the second coreset is associated with the second CSS set, theone or more coresets may comprise the first coreset and the secondcoreset.

In an example, when the one or more coresets comprises the first coresetand the second coreset, the one or more selected cells may comprise thefirst cell and the second cell in response to the first coreset beingconfigured in the first cell and the second coreset being configured inthe second cell.

In an example, when the one or more coresets comprises the first coresetand the second coreset, the one or more selected cells may comprise thefirst cell in response to the first coreset being configured in thefirst cell and the second coreset being configured in the first cell. Inan example, the at least one coreset may comprise the first coreset andthe second coreset. In an example, a first search space set of the firstcoreset of the at least one coreset may be identified by a first searchspace set specific index (e.g., provided by a higher layer parametersearchSpaceId). In an example, the wireless device may monitor the atleast one first PDCCH candidate in the first PDCCH monitoring occasionin the first coreset associated with the first search space set (e.g.,association provided by a higher layer parameter controlResourceSetId).In an example, a second search space set of the second coreset of the atleast one coreset may be identified by a second search space setspecific index (e.g., provided by a higher layer parametersearchSpaceId). In an example, the wireless device may monitor the atleast one second PDCCH candidate in the second PDCCH monitoring occasionin the second coreset associated with the second search space set (e.g.,association provided by a higher layer parameter controlResourceSetId).In an example, the first search space set specific index may be lowerthan the second search space set specific index. In response to thefirst search space set specific index being lower than the second searchspace set specific index, for a coreset determination rule, the wirelessdevice may select the first search space set. In an example, in responseto the selecting, for the coreset determination rule, the wirelessdevice may monitor the at least one first PDCCH candidate in the firstPDCCH monitoring occasion in the first coreset on the active DL BWP ofthe first cell. In an example, in response to the selecting, for thecoreset determination rule, the wireless device may stop monitoring theat least one second PDCCH candidate in the second PDCCH monitoringoccasion in the second coreset on the active DL BWP of the first cell.In an example, in response to the selecting, the wireless device maydrop monitoring the at least one second PDCCH candidate in the secondPDCCH monitoring occasion in the second coreset on the active DL BWP ofthe first cell.

In an example, the first cell may be identified by a first cell-specificindex. In an example, the second cell may be identified by a secondcell-specific index. In an example, the first cell-specific index may belower than the second cell-specific index. In an example, when the oneor more selected cells comprises the first cell and the second cell, thewireless device may select the first cell in response to the firstcell-specific index being lower than the second cell-specific index.

In an example, when the first coreset is associated with the first CSSset and the second coreset is associated with the second USS set, theone or more coresets may comprise the first coreset. In an example, whenthe one or more coresets comprises the first coreset, the one or moreselected cells may comprise the first cell in response to the firstcoreset being configured in the first cell.

In an example, when the first coreset is associated with the first USSset and the second coreset is associated with the second CSS set, theone or more coresets may comprise the second coreset. In an example,when the one or more coresets comprises the second coreset, the one ormore selected cells may comprise the first cell in response to thesecond coreset being configured in the first cell. In an example, whenthe one or more coresets comprises the second coreset, the one or moreselected cells may comprise the second cell in response to the secondcoreset being configured in the second cell.

In an example, the wireless device may determine that the one or morecoresets are associated with one or more selected cells of the one ormore cells. In an example, the base station may configure a firstcoreset of the one or more coresets in a first cell of the one or moreselected cells. In an example, the base station may configure a secondcoreset of the one or more coresets in the first cell. In an example,the base station may configure a third coreset of the one or morecoresets in a second cell of the one or more selected cells. In anexample, the first cell and the second cell may be different.

In an example, the wireless device may receive, from the base station,one or more configuration parameters. The one or more configurationparameters may indicate cell-specific indices (e.g., provided by ahigher layer parameter servCellIndex) for the one or more cells. In anexample, each cell of the one or more cells may be identified by arespective one cell-specific index of the cell-specific indices. In anexample, a cell-specific index of a cell of the one or more selectedcells may be lowest among the cell-specific indices of the one or moreselected cells.

In an example, when the wireless device determines that the one or morecoresets are associated with the one or more selected cells of the oneor more cells, for the coreset determination rule, the wireless devicemay select the cell in response to the cell-specific index of the cellbeing lowest among the cell-specific indices of the one or more selectedcells.

In an example, the base station may configure at least one coreset ofthe one or more coresets in the (selected) cell. In an example, at leastone search space set of the at least one coreset may have at least onePDCCH candidate in the overlapping PDCCH monitoring occasions and/or maybe a CSS set.

In an example, the one or more configuration parameters may indicatesearch space set specific indices (e.g., provided by a higher layerparameter searchSpaceId) for the at least one search space set of thecell. In an example, each search space set of the at least one searchspace set may be identified by a respective one search space setspecific index of the search space set specific indices. In an example,the wireless device may determine that a search space specific index ofa search space set of the at least one search space set may be thelowest among the search space set specific indices of the at least onesearch space set. In response to the determining that the search spacespecific index of the search space set specific index being the lowestamong the search space set specific indices of the at least one searchspace set, for the coreset determination rule, the wireless device mayselect the search space set. In an example, the search space set may beassociated with a selected coreset of the at least one coreset (e.g.,association provided by a higher layer parameter controlResourceSetId).

In an example, when the wireless device monitors the one or more PDCCHcandidates in the overlapping PDCCH monitoring occasions in theplurality of coresets and the plurality of the coresets have thedifferent QCL-TypeD property, the wireless device may monitor at leastone PDCCH in the selected coreset of the plurality of the coresets on anactive DL BWP of the cell of the one or more cells in response to theselecting the cell and/or the selecting the search space set associatedwith the selected coreset. In an example, the wireless device may selectthe selected coreset associated with the search space set and the cellfor the coreset determination rule.

In an example, the selected coreset may have a first QCL-TypeD property.In an example, a second coreset of the plurality of the coresets mayhave a second QCL-TypeD property. In an example, the selected coresetand the second coreset may be different.

In an example, the first QCL-TypeD property and the second QCL-TypeDproperty may be the same. In an example, the wireless device may monitorat least one second PDCCH candidate (in the overlapping PDCCH monitoringoccasions) in the second coreset of the plurality of the coresets inresponse to the first QCL-TypeD property of the selected coreset and thesecond QCL-TypeD property of the second coreset being the same.

In an example, the first QCL-TypeD property and the second QCL-TypeDproperty may be different. In an example, the wireless device may stopmonitoring at least one second PDCCH candidate (in the overlapping PDCCHmonitoring occasions) in the second coreset of the plurality of thecoresets in response to the first QCL-TypeD property of the selectedcoreset and the second QCL-TypeD property of the second coreset beingdifferent. In an example, the wireless device may drop monitoring atleast one second PDCCH candidate (in the overlapping PDCCH monitoringoccasions) in the second coreset of the plurality of the coresets inresponse to the first QCL-TypeD property of the selected coreset and thesecond QCL-TypeD property of the second coreset being different.

In an example, for the coreset determination rule, a wireless device mayconsider that a first QCL type (e.g., QCL TypeD) property of a first RS(e.g., SS/PBCH block) is different from a second QCL type (e.g., QCLTypeD) property of a second RS (CSI-RS)

In an example, for the coreset determination rule, a first RS (e.g.,CSI-RS) may be associated (e.g., QCL-ed) with an RS (e.g., SS/PBCHblock) in a first cell. In an example, a second RS (e.g., CSI-RS) may beassociated (e.g., QCL-ed) with the RS in a second cell. In response tothe first RS and the second RS being associated with the RS, thewireless device may consider that a first QCL type (e.g., QCL TypeD)property of the first RS and a second QCL type (e.g., QCL TypeD)property of the second RS are the same.

In an example, the wireless device may determine a number of active TCIstates from the plurality of coresets.

In an example, a wireless device may monitor multiple search space setsassociated with different CORESETs for one or more cells (e.g., for asingle cell operation or for an operation with carrier aggregation in asame frequency band). In an example, at least two monitoring occasionsof at least two search space sets of the multiple search space sets mayoverlap in time (e.g., at least one symbol, at least one slot, subframe,etc.). In an example, the at least two search space sets may beassociated with at least two first coresets. The at least two firstcoresets may have different QCL-TypeD properties. In an example, for thecoreset determination rule, the wireless device may monitor at least onesearch space set associated with a selected coreset in an active DL BWPof a cell. In an example, the at least one search space set may be a CSSset. In an example, a cell-specific index of the cell may be lowestamong cell-specific indices of the one or more cells comprising thecell. In an example, at least two second coresets of the cell maycomprise a CSS set. In response to the at least two second coresets ofthe cell comprising the CSS set, the wireless device may select aselected coreset of the at least two second coresets in response to asearch space specific index of a search space set associated with theselected coreset being the lowest among search space specific indices ofsearch space sets associated with the at least two second coresets. Inan example, the wireless device monitors the search space set in the atleast two monitoring occasions.

In an example, the wireless device may determine that the at least twofirst coresets may not be associated with a CSS set. In an example, thewireless device may determine that each coreset of the at least twofirst coresets may not be associated with a CSS set. In an example, forthe coreset determination rule, in response to the determining, thewireless device may monitor at least one search space set associatedwith a selected coreset in an active DL BWP of a cell. In an example,the at least one search space set may be a USS set. In an example, acell-specific index of the cell may be lowest among cell-specificindices of the one or more cells comprising the cell. In an example, atleast two second coresets of the cell may comprise a USS set. Inresponse to the at least two second coresets of the cell comprising theUSS set, the wireless device may select a selected coreset of the atleast two second coresets in response to a search space specific indexof a search space set associated with the selected coreset being thelowest among search space specific indices of search space setsassociated with the at least two second coresets. In an example, thewireless device monitors the search space set in the at least twomonitoring occasions.

In an example, a base station may indicate, to a wireless device, a TCIstate for a PDCCH reception for a coreset of a serving cell by sending aTCI state indication for UE-specific PDCCH MAC CE. In an example, when aMAC entity of the wireless device receives a TCI state indication forUE-specific PDCCH MAC CE on/for a serving cell, the MAC entity mayindicate to lower layers (e.g., PHY) the information regarding the TCIstate indication for the UE-specific PDCCH MAC CE.

In an example, a TCI state indication for UE-specific PDCCH MAC CE maybe identified by a MAC PDU subheader with LCID. The TCI state indicationfor UE-specific PDCCH MAC CE may have a fixed size of 16 bits comprisingone or more fields. In an example, the one or more fields may comprise aserving cell ID, coreset ID, TCI state ID and a reserved bit.

In an example, the serving cell ID may indicate the identity of theserving cell for which the TCI state indication for the UE-specificPDCCH MAC CE applies. The length of the serving cell ID may be n bits(e.g., n=5 bits).

In an example, the coreset ID may indicate a control resource set. Thecontrol resource set may be identified with a control resource set ID(e.g., ControlResourceSetId). The TCI State is being indicated to thecontrol resource set ID for which. The length of the coreset ID may ben3 bits (e.g., n3=4 bits).

In an example, the TCI state ID may indicate a TCI state identified byTCI-StateId. The TCI state may be applicable to the control resource setidentified by the coreset ID. The length of the TCI state ID may be n4bits (e.g., n4=6 bits).

An information element ControlResourceSet may be used to configure atime/frequency control resource set (CORESET) in which to search fordownlink control information.

An information element TCI-State may associate one or two DL referencesignals with a corresponding quasi-colocation (QCL) type. Theinformation element TCI-State may comprise one or more fields includingTCI-StateId and QCL-Info. The QCL-Info may comprise one or more secondfields. The one or more second fields may comprise serving cell index,BWP ID, a reference signal index (e.g., SSB-index,NZP-CSI-RS-ResourceID), and a QCL Type (e.g., QCL-typeA, QCL-typeB,QCL-typeC, QCL-typeD). In an example, the TCI-StateID may identify aconfiguration of a TCI state.

In an example, the serving cell index may indicate a serving cell inwhich a reference signal indicated by the reference signal index islocated in. When the serving cell index is absent in an informationelement TCI-State, the information element TCI-State may apply to aserving cell in which the information element TCI-State is configured.The reference signal may be located on a second serving cell other thanthe serving cell in which the information element TCI-State isconfigured only if the QCL-Type is configured as first type (e.g.,TypeD, TypeA, TypeB). In an example, the BWP ID may indicate a downlinkBWP of the serving cell in which the reference signal is located in.

An information element SearchSpace may define how/where to search forPDCCH candidates in a search space. The search space may be identifiedby a searchSpaceId field in the information element SearchSpace. Eachsearch space may be associated with a control resource set (e.g.,ControlResourceSet). The control resource set may be identified by acontrolResourceSetId field in the information element SearchSpace. ThecontrolResourceSetId field may indicate the control resource set(CORESET) applicable for the SearchSpace.

The wireless device may monitor a downlink radio link quality of a cell(e.g., PCell, SCell, PsCell, SpCell, etc.). Based on the monitoring thedownlink radio link quality, a lower layer of the wireless device (e.g.,PHY, MAC) may indicate out-of-sync (OoS) or in-sync (IS) to a higherlayer of the wireless device (e.g., MAC, RRC). In an example, thewireless device may monitor the downlink radio link quality for anactive downlink BWP of the cell.

In an example, the base station may configure, by a higher layerparameter (e.g., failureDetectionResource), a downlink BWP of the cellwith a set of resource indexes (e.g., through RadioLinkMonitoringRS) fora link monitoring (e.g., radio link monitoring, beam failure recoveryprocedure, link recovery procedure, etc.). The set of resource indexesmay comprise a CSI-RS resource configuration index (e.g., csi-RS-Index).The set of resource indexes may comprise a SS/PBCH block index (e.g.,ssb-Index). The set of resource indexes may indicate one or more RSs(e.g., CSI-RS, SS/PBCH block). In an example, the CSI-RS resourceconfiguration index may indicate a CSI-RS. In an example, the SS/PBCHblock index may indicate a SS/PBCH block.

In an example, a number of resource indexes in the set of resourceindexes may be up to a maximum RS number for the link monitoring (e.g.,radio link monitoring, beam failure recovery procedure, link recoveryprocedure, etc.). In an example, a number of resource indexes in the setof resource indexes may be equal to or less than a maximum RS number forthe link monitoring. In an example, a cardinality of the set of resourceindexes may be up to a maximum RS number for the link monitoring. In anexample, a cardinality of the set of resource indexes may be equal to orless than a maximum RS number for the link monitoring. In an example, anumber of RSs in the one or more RSs may be up to a maximum RS numberfor the link monitoring. In an example, a number of RSs in the one ormore RSs may be equal to or less than a maximum RS number for the linkmonitoring. In an example, the maximum RS number may be configured bythe base station. In an example, the maximum RS number may bepreconfigured. In an example, the maximum RS number may be fixed. In anexample, the maximum RS number may be based on subcarrier spacing. In anexample, the maximum RS number may be based on a maximum number of(e.g., L_max=4, 8, 64) of SS/PBCH blocks transmitted per half frame. Inan example, the maximum RS number may be two when the maximum number isfour. In an example, the maximum RS number may be four when the maximumnumber is four.

In an example, the base station may configure the wireless device withone or more coresets for the downlink BWP. In an example, the basestation may configure a coreset of the one or more coresets with atleast two TCI states (e.g., by a first higher layer parametertci-StatesPDCCH-ToAddList and/or a second higher layer parametertci-StatesPDCCH-ToReleaseList). In an example, the wireless device mayreceive an activation command (e.g. a MAC CE activation command)indicating/activating a TCI state of the at least two TCI states for thecoreset. In an example, the (activated or active) TCI state maycomprise/indicate an RS index (e.g., csi-RS-Index, ssb-index) indicatingan RS (e.g., CSI-RS). Based on the receiving the activation commandindicating/activating the TCI state, the wireless device may monitor fora DCI in the coreset based on the RS indicated by the (activated oractive) TCI state. Based on the receiving the activation commandindicating/activating the TCI state, the wireless device may assume thatone or more DMRS antenna ports for a PDCCH reception in the coreset isquasi co-located with the RS.

In an example, the base station may configure a coreset of the one ormore coresets with a TCI state (e.g., by a first higher layer parametertci-StatesPDCCH-ToAddList and/or a second higher layer parametertci-StatesPDCCH-ToReleaseList). In an example, based on being configuredwith the TCI state, the wireless device may not monitor for anactivation command (e.g. a MAC CE activation command) for the coreset.In an example, based on being configured with the TCI state, thewireless device may activate the TCI state for the coreset. In anexample, the (activated or active) TCI state may comprise/indicate an RSindex (e.g., csi-RS-Index, ssb-index) indicating an RS (e.g., CSI-RS).The wireless device may monitor for a DCI in the coreset based on the RSindicated by the (activated or active) TCI state. The wireless devicemay assume that one or more DMRS antenna ports for a PDCCH reception inthe coreset is quasi co-located with the RS.

In an example, the base station may not configure, by a higher layerparameter (e.g., failureDetectionResource), the downlink BWP of the cellwith a set of resource indexes (e.g., through RadioLinkMonitoringRS) fora link monitoring. In an example, the base station may configure, forPDCCH receptions, one or more TCI states (e.g., by a first higher layerparameter tci-StatesPDCCH-ToAddList and/or a second higher layerparameter tci-StatesPDCCH-ToReleaseList) for the one or more coresets ofthe downlink BWP. In an example, the one or more TCI states maycomprise/indicate one or more RSs (e.g., CSI-RSs). In an example, thewireless device may use, for the link monitoring, RS(s)indicated/provided/included in active TCI state(s) of the one or moreTCI states. In an example, the RS(s) may have a QCL type(s) (e.g.,QCL-TypeD). In an example, the RS(s) may be periodic. In an example, theRS(s) may be aperiodic. In an example, the RS(s) may be semi-persistent.In an example, the one or more coresets of the downlink BWP may comprisea first coreset and a second coreset. In an example, the wireless devicemay receive, for the first coreset, a first activation command (e.g.,MAC CE activation command) indicating/activating a first TCI state ofthe one or more TCI states. The first TCI state may indicate a first RSof the one or more RSs. In an example, the wireless device may receive asecond activation command indicating/activating a second TCI state ofthe one or more TCI states. The second TCI state may indicate a secondRS of the one or more RSs. The first RS may have a QCL-TypeD. The secondRS may have a QCL-TypeD. In an example, the wireless device may, for thelink monitoring, use/select the first RS indicated by the first (active)TCI state and the second RS indicated by the second (active) TCI state.

In an example, the base station may not configure, by a higher layerparameter (e.g., failureDetectionResource), the downlink BWP of the cellwith a set of resource indexes (e.g., through RadioLinkMonitoringRS) fora link monitoring. In an example, the base station may configure, forPDCCH receptions, one or more TCI states (e.g., by a first higher layerparameter tci-StatesPDCCH-ToAddList and/or a second higher layerparameter tci-StatesPDCCH-ToReleaseList) for the one or more coresets ofthe downlink BWP. In an example, a maximum number of SS/PBCH blockstransmitted per half frame may be a first number. In an example, thefirst number may be four (e.g., L_max=4). In an example, the firstnumber may be eight (e.g., L_max=8). In an example, the first number maybe sixty-four (e.g., L_max=64). In an example, a number of the one ormore coresets may be greater than the maximum RS number. In an example,the one or more coresets of the downlink BWP may comprise a firstcoreset, a second coreset, and a third coreset (the number of the one ormore coresets is equal to three). In an example, the maximum RS numbermay be two. In an example, a number of coresets in the one or morecoresets may be greater than the maximum RS number. In an example, theone or more coresets of the downlink BWP may comprise a first coreset, asecond coreset, and a third coreset (the number of coresets in the oneor more coresets is equal to three). In an example, the maximum RSnumber may be two. Based on the number of coresets in the one or morecoresets being greater than the maximum RS number, the wireless devicemay apply an RS selection rule for the link monitoring. In an example,the wireless device may select, in the RS selection rule for the linkmonitoring, RS(s) indicated by active TCI state(s) of the one or moreTCI states. In an example, the selecting the RSs may comprise selectingthe RSs indicated by the active TCI state(s) of coresets, of the one ormore coresets, associated with (or linked to) search space sets in anorder from a shortest monitoring periodicity. In an example, theselecting the RSs may comprise selecting the RSs indicated by the activeTCI state(s) of coresets, of the one or more coresets, identified by, inan order from, a highest coreset-specific index. In an example, a numberof the RS(s) may be equal to less than the maximum RS number. In anexample, a number of RSs in the RS(s) may be equal to less than themaximum RS number.

In an example, an availability of a channel (e.g., downlink controlchannel, PDCCH) may be unpredictable in unlicensed bands. Based on theavailability of the channel being unpredictable, a transmission of acontrol information (e.g., DCI, data) on/in PDCCH monitoring occasionsof the channel may not be guaranteed. The power consumption of thewireless device may increase based on monitoring PDCCH candidates forthe control information in the PDCCH monitoring occasions of the channelwhen the transmission of the control information is not guaranteed.

In an example, a wireless device may support a power saving mode. When abuffer status or channel conditions for a wireless device changes, itmay be beneficial to either increase or decrease a periodicity of PDCCHmonitoring occasions. In an example, decreasing the periodicity of PDCCHmonitoring occasions may reduce a time required to complete a session(e.g. buffer increases or channel conditions improve). In an example,increasing the periodicity of PDCCH monitoring occasions (e.g. buffer isempty or channel conditions deteriorate and UE may not be scheduled atleast in some search space sets) may reduce power consumption.

In an example, the base station may (e.g., dynamically via L1 (e.g.,DCI) or L2 signaling (e.g., MAC CE)) change/adjust PDCCH monitoringbehavior of the wireless device (or the physical layer of the wirelessdevice). The changing/adjusting the PDCCH monitoring behavior maydecrease the power consumption of the wireless device and reducedecoding complexity of the wireless device. The changing/adjusting thePDCCH monitoring behavior may reduce power consumption by bettermatching the dynamic traffic characteristics/patterns.

In an example, a wireless device may receive, e.g., from a base station,one or more configuration parameters indicating a plurality of groups ofsearch space sets for an unlicensed cell. The plurality of groups ofsearch space sets may comprise a first group of search space sets and asecond group of search space sets.

In an example, the wireless device may monitor downlink control channelsof the unlicensed cell more frequently outside of a channel occupancytime (COT) of the unlicensed cell than inside of the COT. Frequentmonitoring of the downlink control channels outside of the COT mayreduce missing reception of a downlink control information indicating aduration of the COT. Frequent monitoring of the downlink controlchannels outside of the COT may reduce a delay with receiving a downlinkcontrol information indicating a duration of the COT. A secondperiodicity of the second group of search space sets may be smaller (orshorter) than a first periodicity of the first group of search spacesets. Based on the second periodicity being smaller (or shorter) thanthe first periodicity, the wireless device may monitor the downlinkcontrol channels according to the second group of search space sets morefrequently than according to the first group of search space sets. Thewireless device may monitor the first group of search space sets insideof the COT. The wireless device may monitor the second group of searchspace sets outside of the COT. The first group of search space sets thatis monitored inside of the COT may be sparser than the second group ofsearch space sets that is monitored outside of the COT.

In an example, the wireless device may monitor the downlink controlchannels of the unlicensed cell based on (or according to) the secondgroup of search space sets. The wireless device may detect/receive adownlink control information. The downlink control information mayindicate start of a channel occupancy time (COT) of the unlicensed celland duration of the COT. Based on the detecting/receiving the downlinkcontrol information, the wireless device may stop monitoring thedownlink control channels of the unlicensed cell according to the secondgroup of search space sets and start monitoring the downlink controlchannels of the unlicensed cell according to the first group of searchspace sets.

In existing technologies, the wireless device may stop monitoring thedownlink control channels of the unlicensed cell according to the firstgroup of search space sets at the end of the duration of the COTindicated by the downlink control information. The wireless device maystart monitoring the downlink control channels of the unlicensed cellaccording to the second group of search space sets at the end of theduration of the COT indicated by the downlink control information.

In an example scenario, the wireless device may monitor downlink controlchannels of an unlicensed cell based on (or according to) the secondgroup of search space sets. The wireless device may detect/receive adownlink control information. The downlink control information mayindicate start of a COT of the unlicensed cell. The downlink controlinformation may not indicate duration of the COT. Based on thedetecting/receiving the downlink control information, the wirelessdevice may stop monitoring the downlink control channels of theunlicensed cell according to the second group of search space sets andstart monitoring the downlink control channels of the unlicensed cellaccording to the first group of search space sets. Implementation of theexisting technologies, where the wireless device stops monitoring thedownlink control channels according to the first group of search spacesets and starts monitoring the downlink control channels according tothe second group of search space sets at the end of the duration of theCOT may not be efficient when the downlink control information does notindicate the duration of the COT. For example, the wireless device maynot have information about the end of the COT based on the downlinkcontrol information not indicating the duration of the COT. The wirelessdevice may not start monitoring the downlink control channels accordingto the second group of search space sets at the end of the duration ofthe COT. The wireless device may keep monitoring the downlink controlchannels according to the first group of search space sets after the endof the duration of the COT. The base station may transmit a seconddownlink control information indicating a start of a second COT with adelay based on the wireless device monitoring the downlink controlchannels according to the first set of search space sets that aresparser than the second set of search space sets. The wireless devicemay detect/receive the second downlink control information indicatingthe start of the COT with the delay. The wireless device may start adata communication with the delay based on detecting/receiving thesecond downlink control information with the delay.

Example embodiments enhance/improve a timing of switching monitoring ofgroups of search space sets. For example, a timing of switchingmonitoring of groups of search space sets is improved when a downlinkcontrol information does not indicate a duration of a COT. For example,a timing of switching monitoring of groups of search space sets isimproved when a duration of a COT is long (e.g., 20 ms, 30 ms. 40 ms).For example, the wireless device may receive/detect a downlink controlinformation indicating a start of a COT of an unlicensed cell. Thewireless device may stop monitoring the downlink control channels of theunlicensed cell according to the second group of search space sets andstart monitoring the downlink control channels of the unlicensed cellaccording to the first group of search space sets based onreceiving/detecting the downlink control information. The wirelessdevice may further start a time window based on receiving/detecting thedownlink control information. The wireless device may stop monitoringthe downlink control channels according to the first group of searchspace sets and starts monitoring the downlink control channels accordingto the second group of search space sets based on an expiry of the timewindow. This may reduce a delay of receiving a second downlink controlinformation indicating a start of a second COT. The base station maytransmit the second downlink control information indicating the secondCOT without the delay. The wireless device may start a datacommunication without the delay based on detecting/receiving the seconddownlink control information without the delay.

FIG. 17 shows an example of monitoring a downlink control channel in anunlicensed band as per an aspect of an embodiment of the presentdisclosure.

In an example, a downlink channel being available may comprise that abase station determines a successful LBT for the downlink channel. In anexample, a downlink channel being available may comprise that a wirelessdevice determines a successful LBT for the uplink channel.

In an example, a downlink burst (or downlink transmission burst ortransmission burst, and the like, for example TxOP/COT in FIG. 17) maystart from a symbol of a slot (e.g., 6^(th) symbol of slot n in FIG.17). The base station may determine that a successful LBT in the slot(or the symbol of the slot). In an example, the LBT may succeed in afirst symbol (e.g., 1st symbol, 4th symbol, 6th symbol, 9th symbol,etc.) of a first slot (e.g., slot n in FIG. 17). In an example, thedownlink burst may start based on the first symbol (e.g., at the firstsymbol, k symbols after the first symbol, k=0, 1, 2, for example 6^(th)symbol in slot n in FIG. 17). In an example, the downlink burst may endin a second symbol (e.g., 1st symbol, 3th symbol, 7th symbol, 9thsymbol, for example 5^(th) symbol in FIG. 17) of a second slot (e.g.,slot n+3 in FIG. 17).

In an example, the first symbol may be any symbol (e.g., 1^(st) symbol,2^(nd) symbol, . . . , 14^(th) symbol) of the first slot. Based on thefirst symbol being any symbol of the first slot, the wireless device maymonitor for an initial downlink signal frequently (e.g., per symbollevel, per mini-slot level) before the COT (e.g., pre-COT phase in FIG.17, or named as third phase). Based on the first symbol being any symbolof the first slot, the wireless device may monitor for a downlink signal(e.g., DCI scheduling PDSCH) frequently (e.g., per symbol level, permini-slot level) at the beginning of the COT (e.g., partial slot at thebeginning of the COT, beginning of COT phase in FIG. 17, or named as asecond phase). In an example, the base station has a flexibility totransmit the initial downlink signal (e.g., the COT information, theinitial downlink signal, PDCCH, DCI) when the LBT is successful based onthe wireless device monitoring for the initial downlink signalfrequently.

In an example, a wireless device may operate in an unlicensed band. Inan example, a wireless device may support a power saving mode. Thewireless device may be configured with at least two PDCCH monitoringoccasions (e.g., for a search space set).

In an example, a wireless device may operate in an unlicensed band. Inan example, a wireless device may support a power saving mode. Thewireless device may be configured with at least two PDCCH monitoringconfigurations (comprising an offset, periodicity and a number of PDCCHcandidates, symbols for PDCCH monitoring in the slots) (e.g., for asearch space set).

In an example, the wireless device being configured with the at leasttwo PDCCH monitoring configurations may comprise that the wirelessdevice monitors PDCCH candidates in at least two PDCCH monitoringoccasions (in different modes, or for different procedures). Thewireless device being configured with the at least two PDCCH monitoringconfigurations may comprise that the wireless device is configured withat least two PDCCH monitoring periodicities.

In an example, the wireless device may select a PDCCH monitoringconfiguration among the at least two PDCCH monitoring configurationsbased on whether an COT (e.g., TxOP/COT in FIG. 17) is going or not(e.g., the second phase (beginning of a COT phase), a first phase(remainder of the COT), the third phase (outside of a COT)). In anexample, the wireless device may select a first PDCCH monitoringconfiguration of the at least two PDCCH monitoring configurations in thefirst phase (e.g., remainder of the COT in FIG. 17, monitoring the firstsymbol of every slot within the COT, e.g., slots n+1, n+2 and n+3). Inan example, the wireless device may select a second PDCCH monitoringconfiguration of the at least two PDCCH monitoring configurations in thesecond phase (e.g., beginning of COT phase in FIG. 17, monitoring everyother symbol of the partial slot n). In an example, the wireless devicemay select a third PDCCH monitoring configuration of the at least twoPDCCH monitoring configurations in the third phase.

In an example, the wireless device may monitor, for a first downlinksignal/channel (e.g., GC-PDCCH, PDCCH, DCI, DMRS, RS, initial downlinksignal, etc.), first PDCCH candidates in first PDCCH monitoringoccasions of the at least two PDCCH monitoring occasions in the firstphase (e.g., non-power saving mode, remainder of the COT). In anexample, the wireless device may monitor, for a second downlinksignal/channel (e.g., GC-PDCCH, PDCCH, DCI, DMRS, RS, initial downlinksignal, etc.), second PDCCH candidates in second PDCCH monitoringoccasions of the at least two PDCCH monitoring occasions in the secondphase (e.g., power saving mode, beginning of COT phase).

In an example, in an unlicensed band, the second PDCCH monitoringoccasions in the second phase (e.g., before COT start, for an initialduration after the COT starts, partial slot after the COT starts, e.g.,till a first slot boundary of a COT, slot n in FIG. 17) may be morefrequent than the first PDCCH monitoring occasions in the first phase(e.g., rest of the COT, after the first slot boundary of a COT). Thesecond PDCCH monitoring occasions being more frequent than the firstPDCCH monitoring occasions may comprise that second PDCCH monitoringperiodicities of the second PDCCH monitoring occasions may be shorterthan first PDCCH monitoring periodicities of the first PDCCH monitoringoccasions. In an example, the second phase may have a finer timegranularity for PDCCH monitoring/transmission based on the second PDCCHmonitoring occasions being more frequent than the first PDCCH monitoringoccasions.

In an example, the wireless device may support mini-slot basedscheduling in the second phase. In an example, the wireless device maysupport slot-based scheduling in the second phase. In an example, thewireless device may switch to a slot-based scheduling in the firstphase. In an example, the wireless device may support slot-basedscheduling in the first phase. In an example, in the second phase, thewireless device may monitor the second PDCCH candidates frequently(e.g., symbol-level, mini-slot level) to support non-slot PDSCHtransmission(s).

In an example, monitoring the second PDCCH candidates in the secondPDCCH monitoring occasions with the second PDCCH monitoringperiodicities may increase the power consumption based on the secondPDCCH monitoring periodicities being shorter than the first PDCCHmonitoring periodicities.

In an example, dynamic change of time domain instances (e.g., changefrom second PDCCH monitoring occasions with the second PDCCH monitoringperiodicities to first PDCCH monitoring occasions with the first PDCCHmonitoring periodicities) to monitor/receive a downlink signal/channel(e.g., DCI, PDCCH, DMRS) may decrease the power consumption.

In an example, in a third phase (e.g., pre-COT period, before a start ofa COT), the wireless device may monitor for (or attempt to detect) aninitial downlink signal (e.g., reference signal, DMRS of PDCCH, DMRS ofGC-PDCCH, PDCCH, GC-PDCCH, LBT succeeds signal in FIG. 17). In anexample, the initial downlink signal may be a reference signal (e.g.,DMRS) of a PDCCH (e.g., GC-PDCCH, DCI format 2_0). Based on the initialdownlink signal being the reference signal, the wireless device may notmonitor PDCCH candidates (may not perform PDCCH blind decoding). In anexample, the wireless device may detect the initial downlink signal.Based on the detecting the initial downlink signal, the wireless devicemay determine a downlink burst of the base station. In an example, basedon the detecting the initial downlink signal, the wireless device mayassume that the base station has acquired the (unlicensed) channelserving the wireless device. In an example, based on the detecting theinitial downlink signal, the wireless device may be indicated of thestart of the COT.

In an example, the wireless device may switch from the third phase(Pre-COT phase in FIG. 17) to the second phase (Beginning of COT phasein FIG. 17) based on the detecting the initial downlink signal (e.g.,LBT succeeds). In an example, based on the switching to the secondphase, the wireless device may monitor, for the second downlinksignal/channel (e.g., PDCCH, DCI, DMRS, etc.), the second PDCCHcandidates in the second PDCCH monitoring occasions in the second phase.In an example, the wireless device may detect the initial downlinksignal in a slot (slot n). In an example, the wireless device mayoperate in the second phase in/during the slot (remaining of slot n inFIG. 17). In an example, the wireless device may operate in the secondphase till a boundary of the slot (e.g., next slot boundary, slot n+1).In an example, if the wireless device detects the initial downlinksignal in slot n, the wireless device may monitor the second PDCCHcandidates in the second phase until the boundary of slot n+k (e.g.,k=0, k=1, k=2). In an example, the wireless device may detect theinitial downlink signal in a slot. In an example, the wireless devicemay operate in the second phase till a boundary of a second slot (e.g.,slot n in FIG. 17). The second slot may be based on the slot. In anexample, the second slot may be equal to the slot plus a fixed number ofslots (e.g., zero, one, two, or three slots, etc., for example the fixednumber is equal to zero in FIG. 17).

In an example, the wireless device may switch from the second phase tothe first phase at the end of the second slot (at the end of slot n orbeginning of slot n+1 in FIG. 17). In an example, the wireless devicemay switch from the second phase to the first phase at the boundary ofthe second slot. In an example, the wireless device may switch from thesecond phase to the first phase at the second slot. In an example, basedon the switching to the first phase, the wireless device may monitor,for the first downlink signal/channel (e.g., PDCCH, DCI, DMRS, etc.),the first PDCCH candidates in the first PDCCH monitoring occasions inthe first phase (e.g., slot n+1, slot n+2 and slot n+3 in FIG. 17).

In an example, the wireless device may switch from the first phase tothe third phase at the end of a duration of the COT (5th symbol of slotn+3 in FIG. 17). In an example, the duration of the COT may be indicatedby the PDCCH (e.g., DCI format 2_0, GC-PDCCH).

FIG. 18 shows an example of monitoring a downlink control channel in apower saving mode as per an aspect of an embodiment of the presentdisclosure.

In an example, a base station may activate or deactivate a search spaceset via a downlink signal (e.g., PDCCH based power savingsignal/channel).

In an example, the wireless device may select a PDCCH monitoringconfiguration among the at least two PDCCH monitoring configurationsbased on whether being in the power saving mode or not (e.g., the firstphase (non-power saving mode), the second phase (power saving mode)). Inan example, the wireless device may select a first PDCCH monitoringconfiguration of the at least two PDCCH monitoring configurations in thefirst phase (e.g., monitoring the first symbol of every slot, e.g.,slots n+1 and n+2). In an example, the wireless device may select asecond PDCCH monitoring configuration of the at least two PDCCHmonitoring configurations in the second phase (e.g., monitoring everyother slot, e.g., slot n+4, slot n+6 in FIG. 18).

In an example, the first PDCCH monitoring occasions in the first phase(e.g., non-power saving mode) may be more frequent than the second PDCCHmonitoring occasions in the second phase (e.g., power saving mode). Thefirst PDCCH monitoring occasions being more frequent than the secondPDCCH monitoring occasions may comprise that first PDCCH monitoringperiodicities of the first PDCCH monitoring occasions may be shorterthan second PDCCH monitoring periodicities of the second PDCCHmonitoring occasions. In an example, the first phase may have a finertime granularity for PDCCH monitoring/transmission based on the firstPDCCH monitoring occasions being more frequent than the second PDCCHmonitoring occasions.

In an example, monitoring the first PDCCH candidates in the first PDCCHmonitoring occasions with the first PDCCH monitoring periodicities mayincrease the power consumption based on the first PDCCH monitoringperiodicities being shorter than the second PDCCH monitoringperiodicities.

In an example, dynamic change of time domain instances (e.g., changefrom first PDCCH monitoring occasions with the first PDCCH monitoringperiodicities to second PDCCH monitoring occasions with the second PDCCHmonitoring periodicities) to monitor/receive a downlink signal/channel(e.g., DCI, PDCCH, DMRS) may decrease the power consumption.

In an example, a base station may transmit a downlink signal/channel(e.g., PDCCH based power saving signal/channel, for example downlinksignal (e.g., DCI, MAC-CE, DM-RS) for power saving mode in FIG. 18)triggering a dynamic adaptation on configuration parameters for a searchspace set and/or a coreset.

In an example, in a first phase (e.g., non-power saving mode,full-function mode, and the like), the wireless device may monitor, fora first downlink signal/channel (e.g., PDCCH, DCI, DMRS, PDCCH basedpower saving signal/channel etc.), the first PDCCH candidates in thefirst PDCCH monitoring occasions (e.g., slot n, slot n+1 with searchspace monitoring periodicity equal to 1 slot in FIG. 18).

In an example, the wireless device may switch from the first phase to asecond phase (e.g., power saving mode) based on receiving the firstdownlink signal/channel (e.g., Downlink signal in FIG. 18). In anexample, based on the switching to the second phase, the wireless devicemay monitor, for a second downlink signal/channel (e.g., PDCCH, DCI,DMRS, PDCCH based power saving signal/channel, etc.), the second PDCCHcandidates in the second PDCCH monitoring occasions in the second phase(e.g., slot n+3, slot n+4, slot n+5, slot n+6 with search spacemonitoring periodicity equal to 2 slots in FIG. 18). The wireless devicemay start the first power saving timer based on receiving the firstdownlink signal.

In an example, the base station may configure the wireless device with afirst power saving timer. In an example, the wireless device may switchfrom the first phase to the second phase based on an expiry of the firstpower saving timer.

In an example, the wireless device may switch from the second phase tothe first phase based on receiving the second downlink signal/channel.In an example, based on the switching to the first phase, the wirelessdevice may monitor, for a first downlink signal/channel (e.g., PDCCH,DCI, DMRS, PDCCH based power saving signal/channel, etc.), the firstPDCCH candidates in the first PDCCH monitoring occasions in the firstphase.

In an example, the base station may configure the wireless device with asecond power saving timer. In an example, the wireless device may switchfrom the second phase to the first phase based on an expiry of thesecond power saving timer.

In an example, the wireless device may start the first power savingtimer based on receiving the second downlink signal. In an example, thewireless device may start the first power saving timer based onswitching from the second phase to the first phase.

In an example, the wireless device may start the second power savingtimer based on receiving the first downlink signal. In an example, thewireless device may start the second power saving timer based onswitching from the first phase to the second phase.

FIG. 19 shows an example of a configuration of a downlink controlchannel as per an aspect of an embodiment of the present disclosure.

In an example, a wireless device may receive, from a base station, oneor more messages. The one or more messages may comprise one or moreconfiguration parameters of a cell (e.g., PCell, SCell, PsCell, SpCell,etc.). The cell may comprise one or more downlink bandwidth parts(BWPs).

In an example, the one or more messages may comprise one or more RRCmessages (e.g. RRC connection reconfiguration message, RRC connectionreconfiguration with synch message, or RRC connection reestablishmentmessage, or RRC connection setup message).

In an example, each of the one or more downlink BWPs may be in one of anactive state and an inactive state. In an example, the active state of adownlink BWP of the one or more downlink BWPs may comprise monitoring adownlink control channel of the downlink BWP. In an example, theinactive state of a downlink BWP of the one or more downlink BWPs maycomprise not monitoring a downlink control channel of the downlink BWP.

In an example, the wireless device may activate a downlink BWP (e.g.,Downlink BWP in FIG. 19) of the one or more downlink BWPs. In anexample, the activating the downlink BWP may comprise that the wirelessdevice sets the downlink BWP as an active downlink BWP of the cell. Inan example, the activating the downlink BWP may comprise that thewireless device sets the downlink BWP in the active state. In anexample, the activating the downlink BWP may comprise switching thedownlink BWP from the inactive state to the active state.

In an example, the one or more configuration parameters may indicate aplurality of control resource sets (coresets) for the downlink BWP ofthe cell (e.g., by a higher layer parameter ControlResourceSet). In FIG.19, the plurality of coresets of the downlink BWP may comprise Firstcoreset, Second coreset and Third coreset.

In an example, when the downlink BWP is in the active state, thewireless device may monitor PDCCH candidates in the plurality ofcoresets.

In an example, the one or more configuration parameters may indicatecoreset-specific indices for the plurality of coresets (e.g., providedby a higher layer parameter controlResourceSetId). In an example, eachcoreset of the plurality of coresets may be identified by a respectiveone coreset-specific index of the coreset-specific indices. In anexample, a first coreset (e.g., First coreset in FIG. 19) of theplurality of coresets may be identified by a first coreset-specificindex (e.g., zero, one, eight, ten, etc.) of the coreset-specificindices. In an example, a second coreset (e.g., Second coreset in FIG.19) of the plurality of coresets may be identified by a secondcoreset-specific index of the coreset-specific indices. In an example, athird coreset (e.g., Third coreset in FIG. 19) of the plurality ofcoresets may be identified by a third coreset-specific index of thecoreset-specific indices.

In an example, the one or more configuration parameters may indicate oneor more TCI states for a coreset of the plurality of coresets (e.g.,e.g., by a first higher layer parameter tci-StatesPDCCH-ToAddList and/ora second higher layer parameter tci-StatesPDCCH-ToReleaseList). In anexample, the wireless device may receive an activation command (e.g. aMAC CE activation command) indicating/activating a TCI state of the oneor more TCI states for the coreset. In an example, the (activated oractive) TCI state may comprise/indicate an RS index (e.g., csi-RS-Index,ssb-index) indicating an RS (e.g., CSI-RS). The RS may be identified bythe RS index (e.g., indicated by the one or more configurationparameters). Based on the receiving the activation commandindicating/activating the TCI state, the wireless device may monitor,for a downlink signal/channel (e.g., DCI, DMRS, etc.), in the coresetbased on the RS indicated by the (activated or active) TCI state. Basedon the receiving the activation command indicating/activating the TCIstate, the wireless device may assume that one or more DMRS antennaports for a PDCCH reception in the coreset is quasi co-located with theRS.

In an example, the one or more configuration parameters may indicate oneor more first TCI states for the first coreset. In an example, thewireless device may receive a first activation commandindicating/activating a first TCI state of the one or more first TCIstates for the first coreset. In an example, the (activated or active)first TCI state may comprise/indicate a first RS index indicating afirst RS. The first RS may be identified by the first RS index. Based onthe receiving the first activation command indicating/activating thefirst TCI state, the wireless device may monitor, for a downlinksignal/channel (e.g., DCI, DMRS, etc.), in the first coreset based onthe first RS indicated by the (activated or active) first TCI state.Based on the receiving the first activation commandindicating/activating the first TCI state, the wireless device mayassume that one or more DMRS antenna ports for a PDCCH reception in thefirst coreset is quasi co-located with the first RS.

In an example, the one or more configuration parameters may indicate oneor more second TCI states for the second coreset. In an example, thewireless device may receive a second activation commandindicating/activating a second TCI state of the one or more second TCIstates for the second coreset. In an example, the (activated or active)second TCI state may comprise/indicate a second RS index indicating asecond RS. The second RS may be identified by the second RS index. Basedon the receiving the second activation command indicating/activating thesecond TCI state, the wireless device may monitor, for a downlinksignal/channel (e.g., DCI, DMRS, etc.), in the second coreset based onthe second RS indicated by the (activated or active) second TCI state.Based on the receiving the second activation commandindicating/activating the second TCI state, the wireless device mayassume that one or more DMRS antenna ports for a PDCCH reception in thesecond coreset is quasi co-located with the second RS.

In an example, the one or more configuration parameters may indicate oneor more third TCI states for the third coreset. In an example, thewireless device may receive a third activation commandindicating/activating a third TCI state of the one or more third TCIstates for the third coreset. In an example, the (activated or active)third TCI state may comprise/indicate a third RS index indicating athird RS. The third RS may be identified by the third RS index. Based onthe receiving the third activation command indicating/activating thethird TCI state, the wireless device may monitor, for a downlinksignal/channel (e.g., DCI, DMRS, etc.), in the third coreset based onthe third RS indicated by the (activated or active) third TCI state.Based on the receiving the third activation commandindicating/activating the third TCI state, the wireless device mayassume that one or more DMRS antenna ports for a PDCCH reception in thethird coreset is quasi co-located with the third RS.

In an example, the one or more configuration parameters may indicate aplurality of search space sets for the downlink BWP of the cell (e.g.,by a higher layer parameter SearchSpace). In FIG. 19, the plurality ofsearch space sets of the downlink BWP may comprise First search spaceset, Second search space set, Third search space set, and Fourth searchspace set.

In an example, the one or more configuration parameters may indicatesearch space-specific indices for the plurality of search space sets(e.g., provided by a higher layer parameter searchSpaceId). In anexample, each search space set of the plurality of search space sets maybe identified by a respective one search space-specific index of thesearch space-specific indices. In an example, a first search space set(e.g., First search space set in FIG. 19) of the plurality of searchspace sets may be identified by a first search space-specific index ofthe search space-specific indices. In an example, a second search spaceset (e.g., Second search space set in FIG. 19) of the plurality ofsearch space sets may be identified by a second search space-specificindex of the search space-specific indices. In an example, a thirdsearch space set (e.g., Third search space set in FIG. 19) of theplurality of search space sets may be identified by a third searchspace-specific index of the search space-specific indices. In anexample, a fourth search space set (e.g., Fourth search space set inFIG. 19) of the plurality of search space sets may be identified by afourth search space-specific index of the search space-specific indices.

In an example, a search space set of the plurality of search space setsmay be associated with (or linked to) a coreset of the plurality ofcoresets. In an example, the one or more configuration parameters mayindicate the coreset (or coreset-specific index of the coreset) for thesearch space set (e.g., provided by a higher layer parametercontrolResourceSetId in the higher layer parameter SearchSpace).

In an example, the one or more configuration parameters may indicatecoreset indices for the plurality of search space sets (e.g., providedby a higher layer parameter controlResourceSetId in the higher layerparameter SearchSpace). In an example, each search space set of theplurality of search space sets may be associated with (or linked to) acoreset, of the plurality of coresets, identified by a respective onecoreset index of the coreset indices. In an example, the first searchspace set (e.g., First search space set in FIG. 19) may be associatedwith (or linked to) the first coreset (e.g., First coreset in FIG. 19).In an example, the one or more configuration parameters may indicate thefirst coreset-specific index of the first coreset for the first searchspace set. In an example, the second search space set (e.g., Secondsearch space set in FIG. 19) may be associated with (or linked to) thefirst coreset (e.g., First coreset in FIG. 19). In an example, the oneor more configuration parameters may indicate the first coreset-specificindex of the first coreset for the second search space set. In anexample, the third search space set (e.g., Third search space set inFIG. 19) may be associated with (or linked to) the second coreset (e.g.,Second coreset in FIG. 19). In an example, the one or more configurationparameters may indicate the second coreset-specific index of the secondcoreset for the third search space set. In an example, the fourth searchspace set (e.g., Fourth search space set in FIG. 19) may be associatedwith (or linked to) the third coreset (e.g., Third coreset in FIG. 19).In an example, the one or more configuration parameters may indicate thethird coreset-specific index of the third coreset for the fourth searchspace set.

In an example, the one or more configuration parameters may indicatePDCCH monitoring periodicities for the plurality of search space sets(e.g., provided by a higher layer parametermonitoringSlotPeriodicityAndOffset). In an example, each search spaceset of the plurality of search space sets may be associated (orconfigured or monitored) with a respective one PDCCH monitoringperiodicity of the PDCCH monitoring periodicities. In an example, thefirst search space set (e.g., First search space set in FIG. 19) may beassociated (or configured or monitored) with a first PDCCH monitoringperiodicity (e.g., First monitoring periodicity in FIG. 19). In anexample, the second search space set (e.g., Second search space set inFIG. 19) may be associated (or configured or monitored) with a secondPDCCH monitoring periodicity (e.g., Second monitoring periodicity inFIG. 19). In an example, the third search space set (e.g., Third searchspace set in FIG. 19) may be associated (or configured or monitored)with a third PDCCH monitoring periodicity (e.g., Third monitoringperiodicity in FIG. 19). In an example, the fourth search space set(e.g., Fourth search space set in FIG. 19) may be associated (orconfigured or monitored) with a fourth PDCCH monitoring periodicity(e.g., Fourth monitoring periodicity in FIG. 19).

In an example, the wireless device may determine PDCCH monitoringoccasions for the plurality of coresets of the downlink BWP based on thePDCCH monitoring periodicities. In an example, the wireless device maymonitor first PDCCH candidates, for a downlink control signal/channel(e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), in first PDCCH monitoringoccasions for the first search space set associated with (or linked to)the first coreset. In an example, the wireless device may monitor secondPDCCH candidates, for a downlink control signal/channel (e.g., DCI,PDCCH, RS, GC-PDCCH, DMRS, etc.), in second PDCCH monitoring occasionsfor the second search space set associated with (or linked to) the firstcoreset. In an example, the wireless device may monitor third PDCCHcandidates, for a downlink control signal/channel (e.g., DCI, PDCCH, RS,GC-PDCCH, DMRS, etc.), in third PDCCH monitoring occasions for the thirdsearch space set associated with (or linked to) the second coreset. Inan example, the wireless device may monitor fourth PDCCH candidates, fora downlink control signal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS,etc.), in fourth PDCCH monitoring occasions for the fourth search spaceset associated with (or linked to) the third coreset.

In an example, the one or more configuration parameters may not indicateone or more RSs (e.g., RadioLinkMonitoringRS) for a link monitoring(e.g., radio link monitoring, beam failure recovery procedure, linkrecovery procedure, etc.) of the cell. In an example, the wirelessdevice may determine that a number of the plurality of coresets isgreater than a maximum RS number. Based on the determining, the wirelessdevice may apply an RS selection rule. In an example, the wirelessdevice may receive a plurality of activation commands (e.g. a MAC CEactivation command, the first activation command, the second activationcommand and the third activation command) for the plurality of coresets.Based on the receiving the plurality of activation commands, thewireless device may activate a plurality of TCI states (e.g., the firstTCI state, the second TCI state, the third TCI state) for the pluralityof coresets. In an example, the plurality of TCI states may indicate aplurality of RSs (e.g., the first RS, the second RS and the third RS).In an example, in the RS selection rule, the wireless device may select,for the link monitoring, one or more second RSs among the plurality ofRSs. In an example, the selecting may comprise selecting a plurality ofselected TCI states, of the plurality of TCI states, for a plurality ofselected coresets, of the plurality of coresets, associated with (orlinked to) a plurality of selected search space sets, of the pluralityof search space sets, in an order with shortest PDCCH monitoringperiodicities among the PDCCH monitoring periodicities. In an example,the selecting may comprise selecting a plurality of selected TCI states,of the plurality of TCI states, for a plurality of selected coresets, ofthe plurality of coresets, identified with highest coreset-specificindices among the coreset-specific indices. The plurality of selectedTCI states may indicate the one or more second RSs. In an example, anumber of the one or more second RSs may be equal to or less than themaximum RS number. In an example, a number of RSs in the one or moresecond RSs may be equal to or less than the maximum RS number.

In an example, the wireless device may select, for the link monitoring,one or more second RSs among the plurality of RSs. In an example, theselecting may comprise selecting a plurality of selected coresets, ofthe plurality of coresets, associated with (or linked to) a plurality ofselected search space sets, of the plurality of search space sets, withshortest PDCCH monitoring periodicities among the PDCCH monitoringperiodicities of the plurality of search space sets. In an example, theselecting the plurality of selected coresets may comprise selecting aplurality of selected TCI states, of the plurality of TCI states,activated for the plurality of selected coresets. In an example, theselecting may comprise selecting a plurality of selected coresets, ofthe plurality of coresets, identified with highest coreset-specificindices among the coreset-specific indices of the plurality of coresets.In an example, the selecting the plurality of selected coresets maycomprise selecting a plurality of selected TCI states, of the pluralityof TCI states, activated for the plurality of selected coresets. Theplurality of selected TCI states may indicate the one or more secondRSs. In an example, a number of the one or more second RSs may be equalto or less than the maximum RS number. In an example, a number of RSs inthe one or more second RSs may be equal to or less than the maximum RSnumber. Based on the RS selection rule, the wireless device may measurethe one or more second RSs for the link monitoring of the cell.

In an example, the wireless device may determine that a number of theplurality of coresets may be greater/higher than a maximum RS number.Based on the determining, the wireless device may apply an RS selectionrule. In an example, the maximum RS number may be two. The number of theplurality of coresets may be three. In an example, in FIG. 19, the firstcoreset-specific index may be lower than the second coreset-specificindex and the third coreset-specific index. In an example, the secondcoreset-specific index may be lower than the third coreset-specificindex. The first PDCCH monitoring periodicity of the first search spaceset may be 3 slots. The second PDCCH monitoring periodicity of thesecond search space set may be 4 slots. The third PDCCH monitoringperiodicity of the third search space set may be 5 slots. The fourthPDCCH monitoring periodicity of the fourth search space set may be 6slots. In an example, based on the first PDCCH monitoring periodicity ofthe first search space set being the shortest PDCCH monitoringperiodicity among the first, the second, the third and the fourth PDCCHmonitoring periodicities, the wireless device may, for the RS selectionrule, select the first RS of the first coreset associated with (orlinked to) the first search space set for a link monitoring. Afterselecting the first coreset, the wireless device may compare the thirdPDCCH monitoring periodicity of the second coreset and the fourth PDCCHmonitoring periodicity of the third coreset (may not compare the secondPDCCH monitoring periodicity of the (selected) first coreset). In anexample, based on the third PDCCH monitoring periodicity of the thirdsearch space set being the shortest PDCCH monitoring periodicity amongthe third and the fourth PDCCH monitoring periodicities, the wirelessdevice may select, for the link monitoring, the second RS of the secondcoreset associated with (or linked to) the third search space set. Basedon the selections, the wireless device may use the first RS and thesecond RS for the link monitoring of the cell. Based on the selectionsfor the RS selection rule, the wireless device may measure/assess thefirst RS and the second RS for the link monitoring of the cell.

In an example, the wireless device may determine that a number of theplurality of coresets may be greater/higher than a maximum RS number.Based on the determining, the wireless device may apply an RS selectionrule. In an example, the maximum RS number may be two. The number of theplurality of coresets may be three. In an example, in FIG. 19, the firstcoreset-specific index may be lower than the second coreset-specificindex and the third coreset-specific index. In an example, the secondcoreset-specific index may be lower than the third coreset-specificindex. The first PDCCH monitoring periodicity of the first search spaceset may be 3 slots. The second PDCCH monitoring periodicity of thesecond search space set may be 6 slots. The third PDCCH monitoringperiodicity of the third search space set may be 5 slots. The fourthPDCCH monitoring periodicity of the fourth search space set may be 5slots. In an example, based on the first PDCCH monitoring periodicity ofthe first search space set being the shortest PDCCH monitoringperiodicity among the first, the second, the third and the fourth PDCCHmonitoring periodicities, the wireless device may select, for a linkmonitoring, the first RS of the first coreset associated with (or linkedto) the first search space set. After selecting the first RS of thefirst coreset, the wireless device may compare the third PDCCHmonitoring periodicity associated with the second coreset and the fourthPDCCH monitoring periodicity associated with the third coreset (may notcompare the second PDCCH monitoring periodicity of the (selected) firstcoreset). In an example, the wireless device may determine that thethird PDCCH monitoring periodicity and the fourth PDCCH monitoringperiodicity are the same. Based on the determining, the wireless devicemay compare the second coreset-specific index of the second coreset andthe third coreset-specific index of the third coreset. In an example,based on the third coreset-specific index of the third coreset beinghigher than the second coreset-specific index of the second coreset, thewireless device may select, for the link monitoring, the third RS of thethird coreset. Based on the selections, the wireless device may use thefirst RS and the third RS for the link monitoring of the cell. Based onthe selections, the wireless device may measure/assess the first RS andthe third RS for the link monitoring of the cell.

In an example, the wireless device may determine that a number of theplurality of coresets may be greater/higher than a maximum RS number.Based on the determining, the wireless device may apply an RS selectionrule. In an example, the maximum RS number may be two. The number of theplurality of coresets may be three. In an example, in FIG. 19, the firstcoreset-specific index may be lower than the second coreset-specificindex and the third coreset-specific index. In an example, the secondcoreset-specific index may be lower than the third coreset-specificindex. The first PDCCH monitoring periodicity of the first search spaceset may be 5 slots. The second PDCCH monitoring periodicity of thesecond search space set may be 6 slots. The third PDCCH monitoringperiodicity of the third search space set may be 5 slots. The fourthPDCCH monitoring periodicity of the fourth search space set may be 5slots. In an example, the wireless device may compare the first, thesecond, the third and the fourth PDCCH monitoring periodicities. Basedon the comparing, wireless device may determine that the first, thethird and the fourth search space sets have the shortest PDCCHmonitoring periodicity (e.g., 5 slots). Based on the comparing, wirelessdevice may determine that the first PDCCH monitoring periodicity, thethird PDCCH monitoring periodicity and the fourth PDCCH monitoringperiodicity are the same. Based on the determining, the wireless devicemay compare the first coreset-specific index of the first coreset, thesecond coreset-specific index of the second coreset and the thirdcoreset-specific index of the third coreset. In an example, based on thethird coreset-specific index of the third coreset being higher than thefirst coreset-specific index and the second coreset-specific index, thewireless device may select, for a link monitoring, the third RS of thethird coreset. After selecting the third RS of the third coreset, thewireless device may compare the first coreset-specific index of thefirst coreset and the second coreset-specific index of the secondcoreset. Based on the second coreset-specific index being higher thanthe first coreset-specific index, the wireless device may select, forthe link monitoring, the second RS of the second coreset. Based on theselections, the wireless device may use the second RS and the third RSfor the link monitoring of the cell. Based on the selections, thewireless device may measure/assess the second RS and the third RS forthe link monitoring of the cell.

FIG. 20 and FIG. 21 show an example of a configuration of a downlinkcontrol channel as per an aspect of an embodiment of the presentdisclosure.

In an example, a wireless device may receive, from a base station, oneor more messages. The one or more messages may comprise one or moreconfiguration parameters (e.g., configuration parameters in FIG. 21) ofa cell (e.g., PCell, SCell, PsCell, SpCell, etc.). The cell may compriseone or more downlink bandwidth parts (BWPs).

In an example, the wireless device may activate a downlink BWP of theone or more downlink BWPs.

In an example, the one or more configuration parameters may indicate aplurality of control resource sets (coresets) for the downlink BWP ofthe cell (e.g., by a higher layer parameter ControlResourceSet). In FIG.20, the plurality of coresets of the downlink BWP may comprise a firstcoreset (e.g., First coreset in FIG. 20), a second coreset (e.g., Secondcoreset in FIG. 20) and a third coreset (e.g., Third coreset in FIG.20).

In an example, when the downlink BWP is in the active state, thewireless device may monitor PDCCH candidates in the plurality ofcoresets.

In an example, the one or more configuration parameters may indicate aplurality of search space sets for the downlink BWP of the cell (e.g.,by a higher layer parameter SearchSpace). The plurality of search spacesets may comprise a first search space set (e.g., First search space setin FIG. 20) of the first coreset, a second search space set (e.g.,Second search space set in FIG. 20) of the first coreset, a third searchspace set (e.g., Third search space set in FIG. 20) of the secondcoreset, and a fourth search space set (e.g., Fourth search space set inFIG. 20) of the third coreset.

In an example, based on receiving a plurality of activation commands(e.g., MAC CE activation command discussed for FIG. 19), the wirelessdevice may activate a plurality of TCI states (e.g., a first TCI statefor the first coreset, the second TCI state for the second coreset, thethird TCI state for the third coreset discussed in FIG. 19) for theplurality of coresets. In an example, the plurality of TCI states mayindicate a plurality of RSs (e.g., a first RS for the first coreset, asecond RS for the second coreset and a third RS for the third coreset).

In an example, the one or more configuration parameters may indicatePDCCH monitoring periodicities for the plurality of search space sets(e.g., provided by a higher layer parametermonitoringSlotPeriodicityAndOffset). The PDCCH monitoring periodicitiesmay be formed/grouped into at least two groups of PDCCH monitoringperiodicities comprising a first group (or set) of PDCCH monitoringperiodicities (e.g., First group of monitoring periodicities in FIG. 20and FIG. 21) and a second group (or set) of PDCCH monitoringperiodicities (e.g., Second group of monitoring periodicities in FIG. 20and FIG. 21).

In an example, in FIG. 20, the first group of PDCCH monitoringperiodicities may comprise a first PDCCH monitoring periodicity (e.g.,First monitoring periodicity in FIG. 20) of the first search space set,a second PDCCH monitoring periodicity (e.g., Second monitoringperiodicity in FIG. 20) of the second search space set, a third PDCCHmonitoring periodicity (e.g., Third monitoring periodicity in FIG. 20)of the third search space set, and a fourth PDCCH monitoring periodicity(e.g., Fourth monitoring periodicity in FIG. 20) of the fourth searchspace set.

In an example, the one or more configuration parameters may indicate thefirst group (or set) of PDCCH monitoring periodicities for the pluralityof search space sets (e.g., provided by a higher layer parametermonitoringSlotPeriodicityAndOffset). In an example, each search spaceset of the plurality of search space sets may be associated (orconfigured or monitored) with a respective one PDCCH monitoringperiodicity of the first group of PDCCH monitoring periodicities. In anexample, the first search space set (e.g., First search space set inFIG. 20) may be associated (or configured or monitored) with the firstPDCCH monitoring periodicity (e.g., First monitoring periodicity in FIG.20) of the first group of PDCCH monitoring periodicities. In an example,the fourth search space set (e.g., Fourth search space set in FIG. 20)may be associated (or configured or monitored) with the fourth PDCCHmonitoring periodicity (e.g., Fourth monitoring periodicity in FIG. 20)of the first group of PDCCH monitoring periodicities. In an example, thethird search space set (e.g., Third search space set in FIG. 20) may beassociated (or configured or monitored) with the third PDCCH monitoringperiodicity (e.g., Third monitoring periodicity in FIG. 20) of the firstgroup of PDCCH monitoring periodicities.

In an example, the wireless device may determine first PDCCH monitoringoccasions for the plurality of coresets of the downlink BWP based on thefirst group of PDCCH monitoring periodicities. In an example, thewireless device may monitor first PDCCH candidates, for a downlinkcontrol signal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), inthe first PDCCH monitoring occasions for the plurality of coresets in afirst phase (e.g., non-power saving mode, remainder of COT, after thefirst slot boundary of a COT). In an example, the wireless device maymonitor the plurality of the coresets based on the first group of PDCCHmonitoring periodicities in the first phase. In an example, the wirelessdevice may monitor first PDCCH candidates, for a downlink controlsignal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), in thefirst PDCCH monitoring occasions for the plurality of search space setsassociated with (or linked to) the plurality of coresets in the firstphase.

In an example, in FIG. 20, the second group of PDCCH monitoringperiodicities may comprise a fifth PDCCH monitoring periodicity (e.g.,Fifth monitoring periodicity in FIG. 20) of the second search space set,a third PDCCH monitoring periodicity (e.g., Third monitoring periodicityin FIG. 20) of the third search space set, and a sixth PDCCH monitoringperiodicity (e.g., Sixth monitoring periodicity in FIG. 20) of thefourth search space set.

In an example, the one or more configuration parameters may indicate thesecond group (or set) of PDCCH monitoring periodicities for theplurality of search space sets (e.g., provided by a higher layerparameter monitoringSlotPeriodicityAndOffset). In an example, eachsearch space set of the plurality of search space sets may be associated(or configured or monitored) with a respective one PDCCH monitoringperiodicity of the second group of PDCCH monitoring periodicities. In anexample, the second search space set (e.g., Second search space set inFIG. 20) may be associated (or configured or monitored) with the fifthPDCCH monitoring periodicity (e.g., Fifth monitoring periodicity in FIG.20) of the second group of PDCCH monitoring periodicities. In anexample, the fourth search space set (e.g., Fourth search space set inFIG. 20) may be associated (or configured or monitored) with the sixthPDCCH monitoring periodicity (e.g., Sixth monitoring periodicity in FIG.20) of the second group of PDCCH monitoring periodicities. In anexample, the third search space set (e.g., Third search space set inFIG. 20) may be associated (or configured or monitored) with the thirdPDCCH monitoring periodicity (e.g., Third monitoring periodicity in FIG.20) of the second group of PDCCH monitoring periodicities.

In an example, the wireless device may determine second PDCCH monitoringoccasions for the plurality of coresets of the downlink BWP based on thesecond group of PDCCH monitoring periodicities. In an example, thewireless device may monitor second PDCCH candidates, for a downlinkcontrol signal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), inthe second PDCCH monitoring occasions for the plurality of coresets in asecond phase (e.g., power saving mode, beginning of gNB's COT (partialslot), etc.). In an example, the wireless device may monitor theplurality of the coresets based on the second group of PDCCH monitoringperiodicities in the second phase. In an example, the wireless devicemay monitor second PDCCH candidates, for a downlink controlsignal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), in thesecond PDCCH monitoring occasions for the plurality of search space setsassociated with (or linked to) the plurality of coresets in the secondphase.

In an example, a search space set of the plurality of search space setsmay not be associated with (or linked to) the second group of PDCCHmonitoring periodicities. The search space set not being associated with(or linked to) the second group of PDCCH monitoring periodicities maycomprise that the second group of PDCCH monitoring periodicities may notcomprise a PDCCH monitoring periodicity of the search space set. Thesearch space set not being associated with (or linked to) the secondgroup of PDCCH monitoring periodicities may comprise that the secondgroup of PDCCH monitoring periodicities may not comprise any PDCCHmonitoring periodicity of the search space set. The search space set notbeing associated with (or linked to) the second group of PDCCHmonitoring periodicities may comprise that the wireless device does notmonitor PDCCH candidates for the search space set in the second phase.In an example, in FIG. 20, the first search space set is not associatedwith (or linked to) the second group of PDCCH monitoring periodicities.The wireless device may not monitor, for a downlink controlsignal/channel, PDCCH candidates for the first search space set in thesecond phase. A similar discussion may also hold for the first group ofPDCCH monitoring periodicities, e.g., a search space set of theplurality of search space sets may not be associated with (or linked to)the first group of PDCCH monitoring periodicities.

In an example, a PDCCH monitoring periodicity of a search space set ofthe plurality of search space sets may be associated with (or linked to)both the first group of PDCCH monitoring periodicities and the secondgroup of PDCCH monitoring periodicities. The PDCCH monitoringperiodicity of the search space set being associated with (or linked to)both the first group of PDCCH monitoring periodicities and the secondgroup of PDCCH monitoring periodicities may comprise that both the firstgroup of PDCCH monitoring periodicities and the second group of PDCCHmonitoring periodicities comprise the PDCCH monitoring periodicity. Inan example, in FIG. 20, the third PDCCH monitoring periodicity of thethird search space set may be associated with (or linked to) both thefirst group of PDCCH monitoring periodicities and the second group ofPDCCH monitoring periodicities. The wireless device may monitor, for adownlink control signal/channel, PDCCH candidates for the third searchspace set both in the first phase and in the second phase.

In an example, in a first time (e.g., slot, symbol, subframe, mini-slot,frame, etc.), the wireless device may operate in the first phase. In anexample, the wireless device may monitor first PDCCH candidates, for adownlink control signal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS,etc.), in the first PDCCH monitoring occasions (determined based on thefirst group of PDCCH monitoring periodicities) for the plurality ofcoresets in the first phase (e.g., Monitor PDCCH based on the firstgroup of monitoring periodicities in FIG. 21). In an example, thewireless device may monitor the plurality of the coresets based on thefirst group of PDCCH monitoring periodicities in the first phase.

In an example, the one or more configuration parameters may not indicateone or more RSs (e.g., RadioLinkMonitoringRS) for a link monitoring(e.g., radio link monitoring, beam failure recovery procedure, linkrecovery procedure, etc.) of the cell. In an example, the wirelessdevice may determine that a number of the plurality of coresets isgreater than a maximum RS number. Based on the determining, the wirelessdevice may apply an RS selection rule for the link monitoring.

In an example, in the RS selection rule for the link monitoring, thewireless device may, in the first phase, select one or more second RSsamong the plurality of RSs based on the first group of PDCCH monitoringperiodicities. Based on the selecting the one or more second RSs, thewireless device may measure/assess the one or more second RSs for thelink monitoring in the first phase (e.g., Perform link monitoring basedon the one or more second RSs in FIG. 21). In an example, based on themeasuring/assessing the one or more second RSs for the link monitoring,a lower layer (e.g., PHY, MAC) of the wireless device may provideout-of-sync or in-sync to a higher layer (e.g., MAC, RRC) of thewireless device.

In an example, the selecting the one or more second RSs based on thefirst group of PDCCH monitoring periodicities may comprise selecting aplurality of selected TCI states, of the plurality of TCI states, for aplurality of selected coresets, of the plurality of coresets, associatedwith (or linked to) a plurality of selected search space sets, of theplurality of search space sets, in an order with shortest PDCCHmonitoring periodicities among the first group of PDCCH monitoringperiodicities. In an example, the selecting the one or more second RSsbased on the first group of PDCCH monitoring periodicities may compriseselecting a plurality of selected coresets, of the plurality ofcoresets, associated with (or linked to) a plurality of selected searchspace sets, of the plurality of search space sets, with shortest PDCCHmonitoring periodicities among the first group of PDCCH monitoringperiodicities. In an example, a number of the one or more second RSs maybe equal to or less than the maximum RS number. In an example, a numberof RSs in the one or more second RSs may be equal to or less than themaximum RS number.

In an example, in a second time, the wireless device may switch from thefirst phase to the second phase (e.g., based on receiving Downlinksignal/channel (e.g., DCI, MAC-CE, DM-RS in FIG. 21). In an example, ina second time, the wireless device may transition from the first phaseto the second phase.

In an example, the wireless device may monitor second PDCCH candidates,for a downlink control signal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH,DMRS, etc.), in the second PDCCH monitoring occasions (determined basedon the second group of PDCCH monitoring periodicities) for the pluralityof coresets in the second phase. In an example, the wireless device maymonitor the plurality of the coresets based on the second group of PDCCHmonitoring periodicities in the second phase (e.g., Monitor PDCCH basedon the second group of monitoring periodicities in FIG. 21).

In an example, in the RS selection rule for the link monitoring, thewireless device may, in the second phase, select one or more second RSsamong the plurality of RSs based on the first group of PDCCH monitoringperiodicities. Based on the selecting the one or more second RSs, thewireless device may measure/assess the one or more second RSs for thelink monitoring in the second phase (e.g., Perform link monitoring basedon the one or more second RSs in FIG. 21). In an example, based on themeasuring/assessing the one or more second RSs for the link monitoring,a lower layer (e.g., PHY, MAC) of the wireless device may provideout-of-sync or in-sync to a higher layer (e.g., MAC, RRC) of thewireless device.

In an example, the wireless device may determine that a number of theplurality of coresets may be greater/higher than a maximum RS number.Based on the determining, the wireless device may apply an RS selectionrule for a link monitoring. In an example, the maximum RS number may betwo. The number of the plurality of coresets may be three. In anexample, both in the first phase and the second phase, for the RSselection rule, the wireless device may select one or more second RSsbased on the first group of PDCCH monitoring periodicities. Theselecting one or more second RSs based on the first group of PDCCHmonitoring periodicities may comprise that the wireless device does notcompare first PDCCH monitoring periodicities (e.g., the first PDCCHmonitoring periodicity, the second PDCCH monitoring periodicity, etc.)in the first group of PDCCH monitoring periodicities with second PDCCHmonitoring periodicities (e.g., the fifth PDCCH monitoring periodicity,the sixth PDCCH monitoring periodicity, etc.) in the second group ofPDCCH monitoring periodicities. The selecting one or more second RSsbased on the first group of PDCCH monitoring periodicities may comprisethat the wireless device does not take the second PDCCH monitoringperiodicities (e.g., the fifth PDCCH monitoring periodicity, the sixthPDCCH monitoring periodicity, etc.) in the second group of PDCCHmonitoring periodicities into account for the RS selection rule. Theselecting one or more second RSs based on the first group of PDCCHmonitoring periodicities may comprise that the wireless device selects,for the RS selection rule, one or more second RSs based on the firstPDCCH monitoring periodicity, the second PDCCH monitoring periodicity,the third PDCCH monitoring periodicity and a fourth PDCCH monitoringperiodicity of the first group of PDCCH monitoring periodicities.

In an example, in FIG. 20, the first coreset-specific index may be lowerthan the second coreset-specific index and the third coreset-specificindex. In an example, the second coreset-specific index may be lowerthan the third coreset-specific index. The first PDCCH monitoringperiodicity of the first search space set may be 3 slots. The secondPDCCH monitoring periodicity of the second search space set may be 4slots. The third PDCCH monitoring periodicity of the third search spaceset may be 5 slots. The fourth PDCCH monitoring periodicity of thefourth search space set may be 6 slots. The fifth PDCCH monitoringperiodicity of the second search space set may be 8 slots. The sixthPDCCH monitoring periodicity of the fourth search space set may be 9slots. In an example, both in the first phase and the second phase, forthe RS selection rule, the wireless device may select one or more secondRSs based on the first group of PDCCH monitoring periodicities. In anexample, based on the first PDCCH monitoring periodicity of the firstsearch space set being the shortest PDCCH monitoring periodicity amongthe first, the second, the third and the fourth PDCCH monitoringperiodicities of the first group of PDCCH monitoring periodicities, thewireless device may, for the RS selection rule, select the first RS ofthe first coreset associated with (or linked to) the first search spaceset for a link monitoring in both the first phase and the second phase.After selecting the first coreset, the wireless device may compare thethird PDCCH monitoring periodicity and the fourth PDCCH monitoringperiodicity of the first group of PDCCH monitoring periodicities. In anexample, based on the third PDCCH monitoring periodicity of the thirdsearch space set being the shortest PDCCH monitoring periodicity amongthe third and the fourth PDCCH monitoring periodicities of the firstgroup of PDCCH monitoring periodicities, the wireless device may select,for the link monitoring, the second RS of the second coreset associatedwith (or linked to) the third search space set. Based on the selections,the wireless device may use the first RS and the second RS (as the oneor more second RSs) for the link monitoring of the cell in both thefirst phase and the second phase. Based on the selections for the RSselection rule, the wireless device may measure/assess the first RS andthe second RS for the link monitoring of the cell in both the firstphase and the second phase.

In an example, in FIG. 20, the first coreset-specific index may be lowerthan the second coreset-specific index and the third coreset-specificindex. In an example, the second coreset-specific index may be lowerthan the third coreset-specific index. The first PDCCH monitoringperiodicity of the first search space set may be 3 slots. The secondPDCCH monitoring periodicity of the second search space set may be 4slots. The third PDCCH monitoring periodicity of the third search spaceset may be 5 slots. The fourth PDCCH monitoring periodicity of thefourth search space set may be 6 slots. The fifth PDCCH monitoringperiodicity of the second search space set may be 1 slot. The sixthPDCCH monitoring periodicity of the fourth search space set may be 2slots. In an example, both in the first phase and the second phase, forthe RS selection rule, the wireless device may select one or more secondRSs based on the first group of PDCCH monitoring periodicities. In anexample, based on the first PDCCH monitoring periodicity of the firstsearch space set being the shortest PDCCH monitoring periodicity amongthe first, the second, the third and the fourth PDCCH monitoringperiodicities of the first group of PDCCH monitoring periodicities, thewireless device may, for the RS selection rule, select the first RS ofthe first coreset associated with (or linked to) the first search spaceset for a link monitoring in both the first phase and the second phase.After selecting the first coreset, the wireless device may compare thethird PDCCH monitoring periodicity and the fourth PDCCH monitoringperiodicity of the first group of PDCCH monitoring periodicities. In anexample, based on the third PDCCH monitoring periodicity of the thirdsearch space set being the shortest PDCCH monitoring periodicity amongthe third and the fourth PDCCH monitoring periodicities of the firstgroup of PDCCH monitoring periodicities, the wireless device may select,for the link monitoring, the second RS of the second coreset associatedwith (or linked to) the third search space set. Based on the selections,the wireless device may use the first RS and the second RS (as the oneor more second RSs) for the link monitoring of the cell in both thefirst phase and the second phase. Based on the selections for the RSselection rule, the wireless device may measure/assess the first RS andthe second RS for the link monitoring of the cell in both the firstphase and the second phase.

FIG. 22 and FIG. 23 show an example of a configuration of a downlinkcontrol channel as per an aspect of an embodiment of the presentdisclosure.

In an example, a wireless device may receive, from a base station, oneor more messages. The one or more messages may comprise one or moreconfiguration parameters (e.g., Configuration parameters in FIG. 23) ofa cell (e.g., PCell, SCell, PsCell, SpCell, etc.). The cell may compriseone or more downlink bandwidth parts (BWPs).

In an example, the wireless device may activate a downlink BWP of theone or more downlink BWPs.

In an example, the one or more configuration parameters may indicate aplurality of control resource sets (coresets) for the downlink BWP ofthe cell (e.g., by a higher layer parameter ControlResourceSet). In FIG.22, the plurality of coresets of the downlink BWP may comprise a firstcoreset (e.g., First coreset in FIG. 22), a second coreset (e.g., Secondcoreset in FIG. 22) and a third coreset (e.g., Third coreset in FIG.22).

In an example, when the downlink BWP is in the active state, thewireless device may monitor PDCCH candidates in the plurality ofcoresets.

In an example, the one or more configuration parameters may indicate aplurality of search space sets for the downlink BWP of the cell (e.g.,by a higher layer parameter SearchSpace). The plurality of search spacesets may be formed/grouped into at least two groups of search space setscomprising a first group (or set) of search space sets (e.g., Firstgroup of search space sets in FIG. 22 and FIG. 23) and a second group(or set) of search space sets (e.g., Second group of search space setsin FIG. 22 and FIG. 23). The first group of search space sets maycomprise first search space sets. In an example, the first search spacesets may comprise a first search space set (e.g., First search space setin FIG. 22) of the first coreset, a second search space set (e.g.,Second search space set in FIG. 22) of the first coreset, a third searchspace set (e.g., Third search space set in FIG. 22) of the secondcoreset, and a fourth search space set (e.g., Fourth search space set inFIG. 22) of the third coreset. The second group of search space sets maycomprise second search space sets. In an example, the second searchspace sets may comprise a fifth search space set (e.g., Fifth searchspace set in FIG. 22) of the first coreset, the third search space set(e.g., Third search space set in FIG. 22) of the second coreset, and asixth search space set (e.g., Sixth search space set in FIG. 22) of thethird coreset.

In an example, each search space set of the plurality of search spacesets may be associated with a respective one group of search space setof the at least two groups of search space sets. In an example, thefirst search space set may be associated with the first group of searchspace sets. In an example, the third search space set may be associatedwith the first group of search space sets. In an example, the fifthsearch space set may be associated with the second group of search spacesets. In an example, the third search space set may be associated withthe second group of search space sets.

In an example, in FIG. 22, the first group of search space sets may beassociated with (or linked to) a first group of PDCCH monitoringperiodicities of the first search space sets (e.g., the first, thesecond, the third and the fourth search space sets). Based on the firstsearch space sets comprising the first search space set, the secondsearch space set, the third search space set and the fourth search spaceset, the wireless device may determine that first group of PDCCHmonitoring periodicities comprises a first PDCCH monitoring periodicity(e.g., First monitoring periodicity in FIG. 22) of the first searchspace set, a second PDCCH monitoring periodicity (e.g., Secondmonitoring periodicity in FIG. 22) of the second search space set, athird PDCCH monitoring periodicity (e.g., Third monitoring periodicityin FIG. 22) of the third search space set, and a fourth PDCCH monitoringperiodicity (e.g., Fourth monitoring periodicity in FIG. 22) of thefourth search space set. In an example, the wireless device maydetermine first PDCCH monitoring occasions for the plurality of coresetsof the downlink BWP based on the first group of PDCCH monitoringperiodicities. In an example, the wireless device may monitor firstPDCCH candidates, for a downlink control signal/channel (e.g., DCI,PDCCH, RS, GC-PDCCH, DMRS, etc.), in the first PDCCH monitoringoccasions for the plurality of coresets in a first phase (e.g.,non-power saving mode, remainder of COT, after the first slot boundaryof a COT). In an example, the wireless device may monitor the pluralityof the coresets based on the first group of PDCCH monitoringperiodicities in the first phase (e.g., Monitor PDCCH based on the firstgroup of SS sets in FIG. 23).

In an example, in FIG. 22, the second group of search space sets may beassociated with (or linked to) a second group of PDCCH monitoringperiodicities of the second search space sets (e.g., the fifth, thethird and the sixth search space sets). Based on the second search spacesets comprising the fifth search space set, the third search space setand the sixth search space set, the wireless device may determine thatsecond group of PDCCH monitoring periodicities comprises a fifth PDCCHmonitoring periodicity (e.g., Fifth monitoring periodicity in FIG. 22)of the fifth search space set, the third PDCCH monitoring periodicity(e.g., Third monitoring periodicity in FIG. 22) of the third searchspace set, and a sixth PDCCH monitoring periodicity (e.g., Sixthmonitoring periodicity in FIG. 22) of the sixth search space set. In anexample, the wireless device may determine second PDCCH monitoringoccasions for the plurality of coresets of the downlink BWP based on thesecond group of PDCCH monitoring periodicities. In an example, thewireless device may monitor second PDCCH candidates, for a downlinkcontrol signal/channel (e.g., DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), inthe second PDCCH monitoring occasions for the plurality of coresets in asecond phase (e.g., power saving mode, beginning of gNB's COT (partialslot), etc.). In an example, the wireless device may monitor theplurality of the coresets based on the second group of PDCCH monitoringperiodicities in the second phase (e.g., Monitor PDCCH based on thesecond group of SS sets in FIG. 23).

In an example, a search space set of the plurality of search space setsmay not be associated with (or linked to) the second group of searchspace sets. The search space set not being associated with (or linkedto) the second group of search space sets may comprise that the secondgroup of search space sets may not comprise the search space set. Thesearch space set not being associated with (or linked to) the secondgroup of search space sets may comprise that the second group of PDCCHmonitoring periodicities does not comprise a PDCCH monitoringperiodicity of the search space set. The search space set not beingassociated with (or linked to) the second group of search space sets maycomprise that the wireless device does not monitor PDCCH candidates forthe search space set in the second phase. In an example, in FIG. 22, thefirst search space set is not associated with (or linked to) the secondgroup of search space sets. The wireless device may not monitor, for adownlink control signal/channel, PDCCH candidates for the first searchspace set in the second phase. A similar discussion may also hold forthe first group of search space sets, e.g., a search space set of theplurality of search space sets may not be associated with (or linked to)the first group of search space sets.

In an example, a search space set of the plurality of search space setsmay be associated with (or linked to) both the first group of searchspace sets and the second group of search space sets. The search spaceset being associated with (or linked to) both the first group of searchspace sets and the second group of search space sets may comprise thatboth the first group of search space sets and the second group of searchspace sets comprise the search space set. In an example, in FIG. 22, thethird search space set may be associated with (or linked to) both thefirst group of search space sets and the second group of search spacesets. The wireless device may monitor, for a downlink controlsignal/channel, PDCCH candidates for the third search space set both inthe first phase and in the second phase.

FIG. 24 shows an example of a configuration of a downlink controlchannel as per an aspect of an embodiment of the present disclosure.

In an example, a wireless device may receive, from a base station, oneor more messages. The one or more messages may comprise one or moreconfiguration parameters (e.g., Configuration parameters in FIG. 24) ofa cell (e.g., PCell, SCell, PsCell, SpCell, etc.). The cell may compriseone or more downlink bandwidth parts (BWPs).

In an example, the wireless device may activate a downlink BWP of theone or more downlink BWPs.

In an example, the one or more configuration parameters may indicate aplurality of control resource sets (coresets) for the downlink BWP ofthe cell (e.g., by a higher layer parameter ControlResourceSet). Theplurality of coresets may be formed/grouped into at least two groups ofcoresets comprising a first group (or set) of coresets (e.g., Firstgroup of coreset FIG. 24) and a second group (or set) of coresets (e.g.,Second group of coreset FIG. 24).

In an example, the one or more configuration parameters may indicate aplurality of search space sets for the downlink BWP of the cell. Theplurality of search space sets may comprise a first plurality of searchspace sets and a second plurality of search space sets.

In an example, the first plurality of search space sets may beassociated with (or linked to) the first group of coresets (e.g.,provided by a higher layer parameter controlResourceSetId in the higherlayer parameter SearchSpace). In an example, the second plurality ofsearch space sets may be associated with (or linked to) the second groupof coresets (e.g., provided by a higher layer parametercontrolResourceSetId in the higher layer parameter SearchSpace).

In an example, the one or more configuration parameters may indicate afirst group of PDCCH monitoring periodicities comprising first PDCCHmonitoring periodicities for the first plurality of search space sets(e.g., provided by a higher layer parametermonitoringSlotPeriodicityAndOffset). In an example, the wireless devicemay determine first PDCCH monitoring occasions for the first pluralityof coresets of the downlink BWP based on the first group of PDCCHmonitoring periodicities. In an example, the wireless device may monitorfirst PDCCH candidates, for a downlink control signal/channel (e.g.,DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), in the first PDCCH monitoringoccasions for the first plurality of coresets in a first phase (e.g.,non-power saving mode, remainder of COT, after the first slot boundaryof a COT). In an example, the wireless device may monitor the firstplurality of the coresets based on the first group of PDCCH monitoringperiodicities in the first phase (e.g., Monitor PDCCH based on the firstgroup of coresets in FIG. 24).

In an example, the one or more configuration parameters may indicate asecond group of PDCCH monitoring periodicities comprising second PDCCHmonitoring periodicities for the second plurality of search space sets(e.g., provided by a higher layer parametermonitoringSlotPeriodicityAndOffset). In an example, the wireless devicemay determine second PDCCH monitoring occasions for the second pluralityof coresets of the downlink BWP based on the second group of PDCCHmonitoring periodicities. In an example, the wireless device may monitorsecond PDCCH candidates, for a downlink control signal/channel (e.g.,DCI, PDCCH, RS, GC-PDCCH, DMRS, etc.), in the second PDCCH monitoringoccasions for the second plurality of coresets in a second phase (e.g.,power saving mode). In an example, the wireless device may monitor thesecond plurality of the coresets based on the second group of PDCCHmonitoring periodicities in the second phase (e.g., Monitor PDCCH basedon the second group of coresets in FIG. 24).

In an example, a base station may determine a first group of monitoringperiodicities for monitoring a plurality of control resource sets(coresets) in a first phase. In an example, the base station maydetermine a second group of monitoring periodicities for monitoring theplurality of coresets in a second phase based on one or more second RSsselected in an RS selection rule for link monitoring. In an example, theone or more second RSs may be selected based on the first group ofmonitoring periodicities.

Based on the determining the second group of monitoring periodicities,the base station may transmit one or more messages comprising one ormore configuration parameters indicating the first group of monitoringperiodicities and the second group of monitoring periodicities.

In an example, the base station may make sure that one or more RSsselected, in an RS selection rule for link monitoring, based on firstgroup of monitoring periodicities are the same one or more second RSsselected, in the RS selection rule for link monitoring, based on secondgroup of monitoring periodicities.

In an example, the second group of monitoring periodicities may be basedon scaling, by a scaling factor, the first group of monitoringperiodicities. The one or more configuration parameters may indicate thescaling factor. The scaling factor may be preconfigured. The scalingfactor may be fixed.

In an example, a wireless device may receive a DCI comprising a channelstate information (CSI) request field triggering/indicating an aperiodicchannel state information RS (CSI-RS) resource. The wireless device mayreceive the DCI in a scheduling cell (e.g., PCell). The wireless devicemay receive the DCI for a scheduled cell (e.g., SCell). The DCI maytrigger/indicate the aperiodic CSI-RS resource for the scheduled cell.The DCI may indicate a second TCI state (by a TCI field). The second TCIstate may indicate a second RS index of a second RS.

In an example, the one or more configuration parameters may indicate oneor more aperiodic channel state information (CSI) trigger states (e.g.,by a higher layer parameter CSI-AperiodicTriggerStateList). In anexample, the one or more configuration parameters may indicatestate-specific indices for the one or more aperiodic CSI trigger states.In an example, each aperiodic CSI trigger state of the one or moreaperiodic CSI trigger states may be identified by a respective onestate-specific index of the state-specific indices. In an example, anaperiodic CSI trigger state of the one or more aperiodic CSI triggerstates may be identified by a state-specific index. In an example, afirst aperiodic CSI trigger state of the one or more aperiodic CSItrigger states may be identified by a first state-specific index of thestate-specific indices. In an example, a second aperiodic CSI triggerstate of the one or more aperiodic CSI trigger states may be identifiedby a second state-specific index of the state-specific indices.

In an example, the CSI request field may indicate/trigger/initiate anaperiodic CSI trigger state of the one or more aperiodic CSI triggerstates. In an example, the CSI request fieldindicating/triggering/initiating the aperiodic CSI trigger state maycomprise that the CSI request field is equal to a state-specific indexof the aperiodic CSI trigger state.

In an example, the aperiodic CSI trigger state may comprise one or morereport configurations (e.g., a list of NZP-CSI-RS-ResourceSet). In anexample, a report configuration (e.g., NZP-CSI-RS-ResourceSet) of theone or more report configurations may comprise one or more CSI-RSresources (e.g., aperiodic CSI-RS resources, NZP-CSI-RS-Resources).

In an example, the base station may configure a coreset in the scheduledcell. In an example, the one or more configuration parameters mayindicate a TCI state for the coreset. The TCI state may indicate an RSindex of an RS. The coreset may be a dummy coreset without a searchspace set. The wireless device may not monitor PDCCH candidates for aDCI in the coreset. A search space set may not be linked to (orassociated with) the coreset.

In an example, the base station may not configure the reportconfiguration with a higher layer parameter trs-Info. In an example, thebase station may not configure the report configuration with a higherlayer parameter repetition. In an example, the wireless device maydetermine that a scheduling offset between a last symbol of a PDCCHcarrying the DCI and a first symbol of at least one CSI-RS resource ofthe one or more CSI-RS resources in the report configuration may besmaller than a threshold (e.g., beamSwitchTiming). In an example, thewireless device may report the threshold (to the base station). In anexample, the threshold may be a first value (e.g., 14, 28, 48 symbols).Based on the determining, the wireless device may apply the RS indicatedby the TCI state associated with the coreset when receiving theaperiodic CSI-RS.

In an example, the base station may not configure the reportconfiguration with a higher layer parameter trs-Info. In an example, thebase station may not configure the report configuration with a higherlayer parameter repetition. In an example, the wireless device maydetermine that a scheduling offset between a last symbol of a PDCCHcarrying the DCI and a first symbol of at least one CSI-RS resource ofthe one or more CSI-RS resources in the report configuration may belarger than a threshold (e.g., beamSwitchTiming). Based on thedetermining, the wireless device may apply the second RS indicated bythe second TCI state when receiving the aperiodic CSI-RS.

According to various embodiments, a device such as, for example, awireless device, off-network wireless device, a base station, and/or thelike, may comprise one or more processors and memory. The memory maystore instructions that, when executed by the one or more processors,cause the device to perform a series of actions. Embodiments of exampleactions are illustrated in the accompanying figures and specification.Features from various embodiments may be combined to create yet furtherembodiments.

FIG. 25 is a flow diagram as per an aspect of an example embodiment ofthe present disclosure. At 2510, a wireless device may detect a downlinkcontrol information indicating a channel occupancy time of an unlicensedcell. At 2520, the wireless device may monitor a first control channelaccording to a first group of search space sets based on detecting thedownlink control information indicating the channel occupancy time ofthe unlicensed cell. At 2530, the wireless device may determine, duringthe channel occupancy time, an expiry of a time window for switchingbetween the first group of search space sets and a second group ofsearch space sets. At 2540, based on the determining, the wirelessdevice may start monitoring a second control channel according to thesecond group; and stop the monitoring the first control channel.

FIG. 26 is a flow diagram as per an aspect of an example embodiment ofthe present disclosure. At 2610, a wireless device may receive one ormore messages. The one or more messages may comprise one or moreconfiguration parameters. The one or more configuration parameters mayindicate a plurality of control resource sets (coresets). The one ormore configuration parameters may indicate a first group of search spacesets for monitoring the plurality of coresets in a first mode. The oneor more configuration parameters may indicate a second group of searchspace sets for monitoring the plurality of coresets in a second mode. At2620, the wireless device may select reference signals for radio linkmonitoring based on the second group of search space sets. At 2630, thewireless device may measure, both in the first mode and the second mode,the reference signals for the radio link monitoring.

According to an example embodiment, a wireless device may receive one ormore messages. The one or more messages may comprise one or moreconfiguration parameters. The one or more configuration parameters mayindicate a plurality of control resource sets (coresets). The one ormore configuration parameters may indicate a first group of search spacesets for monitoring the plurality of coresets in a first mode. The oneor more configuration parameters may indicate a second group of searchspace sets for monitoring the plurality of coresets in a second mode.According to an example embodiment, the wireless device may selectreference signals for radio link monitoring based on the second group ofsearch space sets. According to an example embodiment, the wirelessdevice may measure, both in the first mode and the second mode, thereference signals for the radio link monitoring.

According to an example embodiment, the wireless device may indicateout-of-synch (OoS) during the measuring based on a quality of thereference signals being worse than a threshold. According to an exampleembodiment, the wireless device may indicate in-synch (IS) during themeasuring based on a quality of the reference signals being better thana threshold.

According to an example embodiment, the selecting the reference signalsmay be further based on the one or more configuration parameters notindicating at least one reference signal for the radio link monitoring.

According to an example embodiment, the wireless device may monitor atleast one coreset of the plurality of coresets based on the referencesignals. According to an example embodiment, the monitoring the at leastone coreset based on the reference signals may comprise one or moredemodulation reference signals (DMRSs) of a physical downlink controlchannel (PDCCH) reception in the at least one coreset being quasico-located with the reference signals. According to an exampleembodiment, the one or more DMRSs may be quasi co-located with thereference signals with respect to QCL-TypeD. According to an exampleembodiment, the monitoring the at least one coreset based on thereference signals may comprise one or more active transmissionconfiguration indicator (TCI) states of the at least one coresetindicating the reference signals.

According to an example embodiment, the selecting the reference signalsmay be further based on monitoring periodicities of the second group ofsearch space sets. According to an example embodiment, the one or moreconfiguration parameters may indicate the monitoring periodicities.According to an example embodiment, the selecting the reference signalsmay be further based on a plurality of coreset indexes of the pluralityof coresets.

Embodiments may be configured to operate as needed. The disclosedmechanism may be performed when certain criteria are met, for example,in a wireless device, a base station, a radio environment, a network, acombination of the above, and/or the like. Example criteria may bebased, at least in part, on for example, wireless device or network nodeconfigurations, traffic load, initial system set up, packet sizes,traffic characteristics, a combination of the above, and/or the like.When the one or more criteria are met, various example embodiments maybe applied. Therefore, it may be possible to implement exampleembodiments that selectively implement disclosed protocols.

A base station may communicate with a mix of wireless devices. Wirelessdevices and/or base stations may support multiple technologies, and/ormultiple releases of the same technology. Wireless devices may have somespecific capability(ies) depending on wireless device category and/orcapability(ies). A base station may comprise multiple sectors. When thisdisclosure refers to a base station communicating with a plurality ofwireless devices, this disclosure may refer to a subset of the totalwireless devices in a coverage area. This disclosure may refer to, forexample, a plurality of wireless devices of a given LTE or 5G releasewith a given capability and in a given sector of the base station. Theplurality of wireless devices in this disclosure may refer to a selectedplurality of wireless devices, and/or a subset of total wireless devicesin a coverage area which perform according to disclosed methods, and/orthe like. There may be a plurality of base stations or a plurality ofwireless devices in a coverage area that may not comply with thedisclosed methods, for example, because those wireless devices or basestations perform based on older releases of LTE or 5G technology.

In this disclosure, “a” and “an” and similar phrases are to beinterpreted as “at least one” and “one or more.” Similarly, any termthat ends with the suffix “(s)” is to be interpreted as “at least one”and “one or more.” In this disclosure, the term “may” is to beinterpreted as “may, for example.” In other words, the term “may” isindicative that the phrase following the term “may” is an example of oneof a multitude of suitable possibilities that may, or may not, beemployed to one or more of the various embodiments.

If A and B are sets and every element of A is also an element of B, A iscalled a subset of B. In this specification, only non-empty sets andsubsets are considered. For example, possible subsets of B={cell1,cell2} are: {cell1}, {cell2}, and {cell1, cell2}. The phrase “based on”(or equally “based at least on”) is indicative that the phrase followingthe term “based on” is an example of one of a multitude of suitablepossibilities that may, or may not, be employed to one or more of thevarious embodiments. The phrase “in response to” (or equally “inresponse at least to”) is indicative that the phrase following thephrase “in response to” is an example of one of a multitude of suitablepossibilities that may, or may not, be employed to one or more of thevarious embodiments. The phrase “depending on” (or equally “depending atleast to”) is indicative that the phrase following the phrase “dependingon” is an example of one of a multitude of suitable possibilities thatmay, or may not, be employed to one or more of the various embodiments.The phrase “employing/using” (or equally “employing/using at least”) isindicative that the phrase following the phrase “employing/using” is anexample of one of a multitude of suitable possibilities that may, or maynot, be employed to one or more of the various embodiments.

The term configured may relate to the capacity of a device whether thedevice is in an operational or non-operational state. Configured mayalso refer to specific settings in a device that effect the operationalcharacteristics of the device whether the device is in an operational ornon-operational state. In other words, the hardware, software, firmware,registers, memory values, and/or the like may be “configured” within adevice, whether the device is in an operational or nonoperational state,to provide the device with specific characteristics. Terms such as “acontrol message to cause in a device” may mean that a control messagehas parameters that may be used to configure specific characteristics ormay be used to implement certain actions in the device, whether thedevice is in an operational or non-operational state.

In this disclosure, various embodiments are disclosed. Limitations,features, and/or elements from the disclosed example embodiments may becombined to create further embodiments within the scope of thedisclosure.

In this disclosure, parameters (or equally called, fields, orInformation elements: IEs) may comprise one or more information objects,and an information object may comprise one or more other objects. Forexample, if parameter (IE) N comprises parameter (IE) M, and parameter(IE) M comprises parameter (IE) K, and parameter (IE) K comprisesparameter (information element) J. Then, for example, N comprises K, andN comprises J. In an example embodiment, when one or more messagescomprise a plurality of parameters, it implies that a parameter in theplurality of parameters is in at least one of the one or more messages,but does not have to be in each of the one or more messages.

Furthermore, many features presented above are described as beingoptional through the use of “may” or the use of parentheses. For thesake of brevity and legibility, the present disclosure does notexplicitly recite each and every permutation that may be obtained bychoosing from the set of optional features. However, the presentdisclosure is to be interpreted as explicitly disclosing all suchpermutations. For example, a system described as having three optionalfeatures may be embodied in seven different ways, namely with just oneof the three possible features, with any two of the three possiblefeatures or with all three of the three possible features.

Many of the elements described in the disclosed embodiments may beimplemented as modules. A module is defined here as an element thatperforms a defined function and has a defined interface to otherelements. The modules described in this disclosure may be implemented inhardware, software in combination with hardware, firmware, wetware (i.e.hardware with a biological element) or a combination thereof, all ofwhich may be behaviorally equivalent. For example, modules may beimplemented as a software routine written in a computer languageconfigured to be executed by a hardware machine (such as C, C++,Fortran, Java, Basic, Matlab or the like) or a modeling/simulationprogram such as Simulink, Stateflow, GNU Octave, or LabVIEWMathScript.Additionally, it may be possible to implement modules using physicalhardware that incorporates discrete or programmable analog, digitaland/or quantum hardware. Examples of programmable hardware comprise:computers, microcontrollers, microprocessors, application-specificintegrated circuits (ASICs); field programmable gate arrays (FPGAs); andcomplex programmable logic devices (CPLDs). Computers, microcontrollersand microprocessors are programmed using languages such as assembly, C,C++ or the like. FPGAs, ASICs and CPLDs are often programmed usinghardware description languages (HDL) such as VHSIC hardware descriptionlanguage (VHDL) or Verilog that configure connections between internalhardware modules with lesser functionality on a programmable device. Theabove mentioned technologies are often used in combination to achievethe result of a functional module.

The disclosure of this patent document incorporates material which issubject to copyright protection. The copyright owner has no objection tothe facsimile reproduction by anyone of the patent document or thepatent disclosure, as it appears in the Patent and Trademark Officepatent file or records, for the limited purposes required by law, butotherwise reserves all copyright rights whatsoever.

While various embodiments have been described above, it should beunderstood that they have been presented by way of example, and notlimitation. It will be apparent to persons skilled in the relevantart(s) that various changes in form and detail can be made thereinwithout departing from the scope. In fact, after reading the abovedescription, it will be apparent to one skilled in the relevant art(s)how to implement alternative embodiments. Thus, the present embodimentsshould not be limited by any of the above described exemplaryembodiments.

In addition, it should be understood that any figures which highlightthe functionality and advantages, are presented for example purposesonly. The disclosed architecture is sufficiently flexible andconfigurable, such that it may be utilized in ways other than thatshown. For example, the actions listed in any flowchart may bere-ordered or only optionally used in some embodiments.

Further, the purpose of the Abstract of the Disclosure is to enable theU.S. Patent and Trademark Office and the public generally, andespecially the scientists, engineers and practitioners in the art whoare not familiar with patent or legal terms or phraseology, to determinequickly from a cursory inspection the nature and essence of thetechnical disclosure of the application. The Abstract of the Disclosureis not intended to be limiting as to the scope in any way.

Finally, it is the applicant's intent that only claims that include theexpress language “means for” or “step for” be interpreted under 35U.S.C. 112. Claims that do not expressly include the phrase “means for”or “step for” are not to be interpreted under 35 U.S.C. 112.

What is claimed is:
 1. A method comprising: receiving, by a wirelessdevice, one or more messages comprising one or more configurationparameters indicating: a plurality of control resource sets (coresets);a first group of search space sets for monitoring the plurality ofcoresets in a first mode; and a second group of search space sets formonitoring the plurality of coresets in a second mode; selectingreference signals for radio link monitoring based on the first group ofsearch space sets; and measuring, both in the first mode and the secondmode, the reference signals for the radio link monitoring.
 2. The methodof claim 1, further comprising indicating out-of-synch (OoS) during themeasuring based on a quality of the reference signals being worse than athreshold.
 3. The method of claim 1, further comprising indicatingin-synch (IS) during the measuring based on a quality of the referencesignals being better than a threshold.
 4. The method of claim 1, whereinthe selecting the reference signals is further based on the one or moreconfiguration parameters not indicating at least one reference signalfor the radio link monitoring.
 5. The method of claim 1, furthercomprising monitoring at least one coreset of the plurality of coresetsbased on the reference signals.
 6. The method of claim 5, wherein themonitoring the at least one coreset based on the reference signalscomprises that one or more demodulation reference signals (DMRSs) of aphysical downlink control channel (PDCCH) reception in the at least onecoreset are quasi co-located with the reference signals.
 7. The methodof claim 5, wherein the monitoring the at least one coreset based on thereference signals comprises that one or more active transmissionconfiguration indicator (TCI) states of the at least one coresetindicate the reference signals.
 8. The method of claim 1, wherein theselecting the reference signals is further based on monitoringperiodicities of the first group of search space sets.
 9. The method ofclaim 8, wherein the one or more configuration parameters indicate themonitoring periodicities.
 10. The method of claim 1, wherein theselecting the reference signals is further based on a plurality ofcoreset indexes of the plurality of coresets.
 11. A wireless devicecomprising: one or more processors; and memory storing instructionsthat, when executed by the one or more processors, cause the wirelessdevice to: receive one or more messages comprising one or moreconfiguration parameters indicating: a plurality of control resourcesets (coresets); a first group of search space sets for monitoring theplurality of coresets in a first mode; and a second group of searchspace sets for monitoring the plurality of coresets in a second mode;select reference signals for radio link monitoring based on the firstgroup of search space sets; and measure, both in the first mode and thesecond mode, the reference signals for the radio link monitoring. 12.The wireless device of claim 11, wherein the instructions, when executedby the one or more processors, further cause the wireless device toindicate out-of-synch (OoS) during the measuring based on a quality ofthe reference signals being worse than a threshold.
 13. The wirelessdevice of claim 11, wherein the instructions, when executed by the oneor more processors, further cause the wireless device to indicatein-synch (IS) during the measuring based on a quality of the referencesignals being better than a threshold.
 14. The wireless device of claim11, wherein the selection of the reference signals is further based onthe one or more configuration parameters not indicating at least onereference signal for the radio link monitoring.
 15. The wireless deviceof claim 11, wherein the instructions, when executed by the one or moreprocessors, further cause the wireless device to monitor at least onecoreset of the plurality of coresets based on the reference signals. 16.The wireless device of claim 15, wherein the monitoring of the at leastone coreset based on the reference signals comprises that one or moredemodulation reference signals (DMRSs) of a physical downlink controlchannel (PDCCH) reception in the at least one coreset are quasico-located with the reference signals.
 17. The wireless device of claim11, wherein the selection of the reference signals is further based onmonitoring periodicities of the first group of search space sets. 18.The wireless device of claim 17, wherein the one or more configurationparameters indicate the monitoring periodicities.
 19. The wirelessdevice of claim 11, wherein the selection the reference signals isfurther based on a plurality of coreset indexes of the plurality ofcoresets.
 20. A system comprising: a base station comprising: one ormore first processors; and first memory storing first instructions that,when executed by the one or more first processors, cause the basestation to transmit one or more messages comprising one or moreconfiguration parameters indicating: a plurality of control resourcesets (coresets); a first group of search space sets for monitoring theplurality of coresets in a first mode; and a second group of searchspace sets for monitoring the plurality of coresets in a second mode;and a wireless device comprising: one or more second processors; andsecond memory storing second instructions that, when executed by the oneor more second processors, cause the wireless device to: receive the oneor more messages; select reference signals for radio link monitoringbased on the first group of search space sets; and measure, both in thefirst mode and the second mode, the reference signals for the radio linkmonitoring.